Sahih muslim book 8 - 3424 and 3425
Book 8, Number 3424:
' A'isha (Allah be pleased with her) reported that Sahla bint Suhail came to Allah's Apostle (may peace be eupon him) and said: Messengerof Allah, I see on the face of Abu Hudhaifa (signs of disgust) on entering of Salim (who is an ally) into (our house), whereupon Allah's Apostle (may peace be upon him) said: Suckle him. She said: How can I suckle him as he is a grown-up man?Allah's Messenger (may peace be upon him) smiled and said: I already know that he is a young man 'Amr has made this addition in his narration that he participated in the Battle of Badr and in the narration of Ibn 'Umar (the words are): Allah's Messenger (may peace be upon him) laughed.
Book 8, Number 3425:
'A'isha (Allah be pleased with her) reported that Salim, the freed slave of Abu Hadhaifa, lived with him and his family in their house. She (i.e. the daughter of Suhail came to Allah's Apostle (may peace be upon him) and said: Salim has attained (puberty) as men attain, and he understands what they understand, and he enters our house freely, I, however, perceive that something (rankles) in the heart of Abu Hudhaifa, whereupon Allah's Apostle (may peace be upon him) said to her: Suckle him and you would become unlawful for him, and ( the rankling ) which Abu Hudhaifa feels in his heart will disappear. She returned and said: So I suckled him, and what (was there) in the heart of Abu Hudhaifa disappeared.