Authentic
Sahih Muslim 1453b
Suckle him, and you will become unlawful for him (in marriage), and (the discomfort) which Abu Hudhayfah feels in his heart will disappear
‘Ā’ishah (may Allah be pleased with her) reported that Sālim, the freed slave of Abu Hudhayfah, was with Abu Hudhayfah and his family in their home. Bint Suhayl came to the Prophet (may Allah's peace and blessings be upon him) and said: "Sālim has attained puberty, and he now perceives what they…
أَرْضِعِيهِ تَحْرُمِي عَلَيْهِ وَيَذْهَبِ الَّذِي فِي نَفْسِ أَبِي حُذَيْفَةَ "