Sahih al-Bukhari 710

Muhammad bin Bashshar narrated to us, he said: The son of Abu Adi told us. He narrated from Sa'id, Sa'id from Qatadah, Qatadah from Hazrat Anas (ra) bin Malik, he from the Prophet (saw). He said: “I begin the Prayer intending to make it long, and then I hear a child crying, and I shorten it, because I know the distress that a mother feels at the crying of her child.” And Musa said: Aban narrated to us. Qatadah told us, (he said:) Hazrat Anas (ra) told us the same, narrating from the Prophet (saw).

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Book 65: Whoever cuts short As-Salat (the prayer) on hearing the cries of a child.