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This is a special Shabbos, as Jews come together in more than 1,500 cities and 104 countries around the world in a spirit of unity to welcome in this year's Shabbos Project. Usually, it takes place on the Torah portion of Lech Lecha, but because of the calendar this year, it is happening on the Shabbos we read the portion of Vayeira. This is so fitting, because the parsha recounts in meticulous detail our founding father Abraham's warmth, hospitality and kindness to others.

The Torah sets the scene. Abraham, at the ripe age of 99, is recovering from his recent brit mila (circumcision). He's in extraordinary pain, it's a searingly hot day in the desert, yet there he is, sitting at the opening of his tent waiting restlessly for guests.

Our sages teach us that Abraham's tent was always open on all four sides, so that anyone needing rest and comfort and shelter could enter. In fact, the Midrash says on that day, God specifically ensured it was an intensely hot day to prevent people from venturing out, so Abraham would be spared the trouble of looking after them. Yet, despite the heat, despite the lingering pain of his circumcision, despite his old age, Abraham remained undeterred. As the day wore on, and Abraham became increasingly distressed at having no opportunity to do kindness, God relented and sent him three angels, masquerading as weary travellers - whom, with the help of his wife, he proceeded to lavish with choice delicacies and painstaking care and attention.

The Torah can span decades and even centuries in a single sentence, but in describing Abraham's archetypal act of kindness, it devotes a number of lengthy verses. Water is fetched, and the travellers are invited to wash their feet and find a shady spot to lie down and rest. Bread is brought as a starter course. Cakes are baked, veal is prepared, and beverages are served. Abraham himself is at the centre of all of these activities, and there's a sense of urgency as he seeks to ensure his guests are made to feel welcome and looked after in every respect.

There is one detail that is especially striking. The parsha begins with the Shechinah - God's Divine Presence - appearing to Abraham and being with him while he recovers from his brit mila. When the travellers appear on the scene, Abraham says: "My Master, if I find favour in your eyes, please do not move on from your servant." (Genesis 18:3) The most obvious reading here is that he is addressing one of the travellers. But, according to one extraordinary explanation in Rashi, these words were actually addressed to God, Himself. In effect, Abraham was asking God to hold on for him, so to speak, while he attended to the needs of the travellers. Based on this, the sages of the Talmud (Shabbat 127a) make a radical statement: "Greater is hachanasat orchim (welcoming guests) than receiving the Divine Presence."

How do we understand these words, which are so surprising and seemingly counterintuitive? The Maharal understands this statement with reference to the Mishna in Pirkei Avot: "Beloved is the human being created in God's image." (Avot 3:18) The Maharal explains the Mishna to mean all human beings have within them a Divine soul, a reflection of God, Himself, and that this makes human beings the greatest tangible manifestation of God's presence on earth. And so, even though the Shechinah came to be with him in the wake of his circumcision, Abraham knew he would in fact have a more meaningful interaction with God through engaging with the Tzelem Elokim - the Divine image - in another human being.

This idea is so central to The Shabbos Project. For the past six years, in thousands of Jewish communities around the world, we've witnessed people coming together in unprecedented ways; we've seen Jews from different backgrounds connect at challah bakes and havdallah concerts and around Shabbos tables like never before. We've seen the possibility of transcending all the barriers and differences that seem to separate us - barriers of language and culture, differences in ideological outlook and levels of religious observance. We've seen walls torn down, families rejuvenated, deep feelings awakened, deep friendships formed.

In essence, through the power of Shabbos, and in a spirit of unity and goodwill and celebration, we've located the Tzelem Elokim in one another. We've put all of our differences aside and - like Abraham - relating to one another on a soul level, as beings created in the image of God. Abraham's example is a rallying call to all of us to continue inviting people in - to make a space for others in our hearts, in our lives, and in our homes. As the Mishna in Pirkei Avot says: "Let your home be wide open" (Avot 1:5), which we learn from Abraham, whose home was open on all sides.

This year, as we gear up for The Shabbos Project once again, let's invite friends and family, but also colleagues and neighbours and even casual acquaintances, to take a seat at our tables. In the US, Cities like San Diego, Los Angeles and Miami, where there has been a specific focus on home hospitality, are taking their cues from Abraham.

But, there's another dimension here. We need to make our homes open and welcoming not just to other people, but to Shabbos itself. Our sages compare Shabbos to a bride. In the magnificent Lecha Dodi, we sing: "Lecha dodi likrat Kallah - Come, my friends, to greet the Bride." That's why Shabbos begins with the special service we call Kabbalat Shabbat, literally the "welcoming in of Shabbos". We actively welcome Shabbos into our lives and ensure our home is a place in which the Shabbos bride can feel comfortable and welcomed - so that we, in turn, can share in her warmth, energy and inspiration.

On this Shabbos in particular, it is so inspiring to think of the countless Jewish households around the world that will be preparing for Shabbos - making sure the food is ready, and the house is clean and tidy, and everyone is in the right mindset and spiritual state to receive the energy and the inspiration of the Shabbos bride. That is also what hachnasat orchim, welcoming guests, is about. We welcome people into our homes, but we also welcome Shabbos. We make our homes Shabbos homes.

That is the vision of The Shabbos Project, but it's also something we can take joy, inspiration and comfort from every Shabbos of the year - welcoming the Shabbos bride, and welcoming others into our lives, with open homes, open hearts and open arms.

Just like our father, Abraham.