How can you (keep your wife) when she (the slave-woman) has claimed that she suckled both of you?

‘‘Uqbah ibn al-Hārith married Umm Yahya bint Abi Ihāb, then a black slave-woman came and told him that she had nursed him and his wife, and that they are thus siblings through nursing. He reported her statement to the Prophet (may Allah's peace and blessings be upon him) and said that she was lying.

The Prophet (may Allah's peace and blessings be upon him) rebuked him for his wish to keep his wife despite the testimony of that slave-woman, saying to him: How can you do that after the woman has given her statement and testified what she knew?