Some scholars disliked freeing a child born of zina

Hazrat Umar says that helping in the path of Allah with two shoes is more beloved to me than freeing a child of adultery.

Hazrat Aisha (may Allah be pleased with her) said: "It is more beloved to me that I give three dates in charity or give a whip in the way of Allah than that I free a child born of adultery."

Hazrat Mujahid states that Hazrat Abbas freed some slaves during his illness, then Hazrat Ibn Abbas (may Allah be pleased with them both) returned two of those slaves. People thought that both of them were born out of wedlock.

It is narrated from Hazrat Mujahid that Hazrat Amr bin Aas freed his slaves during his illness. Hazrat Abdullah bin Amr (may Allah be pleased with him) returned six of those slaves, as he believed that they were from among the children of adultery.

Ibn al-Hanafiyyah narrates that Ali (may Allah be pleased with him) disliked freeing a child born of adultery.