Sahih al-Bukhari Book 78, Hadith 32
I said 'O Allah's Messenger (ﷺ)! Which sin is the greatest?" He said, "To set up a rival unto Allah, though He
Alone created you." I said, "What next?" He said, "To kill your son lest he should share your food
with you." I further asked, "What next?" He said, "To commit illegal sexual intercourse with the wife
of your neighbor." And then Allah revealed as proof of the statement of the Prophet: 'Those who
invoke not with Allah any other god)................. (to end of verse)...' (25.68)
I heard Allah's Messenger (ﷺ) saying, Allah divided Mercy into one hundred parts. He kept ninety nine parts with Him and sent down one part to the earth, and because of that, its one single part, His Creations are merciful to each other, so that even the mare lifts up its hoofs away from its baby animal, lest it should trample on it."
The Prophet (ﷺ) took a child in his lap for Tahnik (i.e. he chewed a date in his mouth and put its juice in the mouth of the child). The child urinated on him, so he asked for water and poured it over the place of the urine.