Discussion regarding prohibition by lineage and breastfeeding.

The Shaykh : And we mentioned that the prohibited women have three causes, which are: lineage, breastfeeding, and affinity. Now, the Prophet (peace and blessings be upon him) equated breastfeeding with what? With lineage?
The student: With lineage.

The Shaykh : With lineage, is that right? With birth? Be sure. With lineage? Now, your companion said with birth, then he went back and said with lineage, right? Meaning, lineage is birth. Well done, correct. Now, is it possible to equate it with affinity, even though the Prophet (peace and blessings be upon him) said that what is prohibited by breastfeeding is prohibited by lineage? Yes, yes.
The student: ... and the stronger position is the choice of the Shaykh al-Islam that it is not equated with it.

The Shaykh : Yes, because the Prophet (peace and blessings be upon him) said and in affinity there is no birth between the in-laws. Now, we mentioned that we can take the path of precaution. How is that done? Brother, yes, did you not attend yesterday? You were present yesterday, yes, yes.
The student: ...

The Shaykh : We prevent him from marrying these women, but we do not make them prohibited for him. Now, is there a precedent for this in the Sunnah? Yes.
The student: ...

The Shaykh : Now, meaning, a boy was disputed over between 'Abd ibn Zuma'ah and Sa'd ibn Abi Waqqas. Sa'd said, "This is my brother's son; he was entrusted to me," and 'Abd ibn Zuma'ah said, "This is my brother, born on my father's bed." So the Prophet (peace and blessings be upon him) ruled that he belongs to whom? To the bed, because he is the son of Zuma'ah. But when he saw the clear resemblance to 'Utbah, he said , as a precaution. Some said it was to implement both pieces of evidence, but there is a problem with that, because implementing both pieces of evidence here is impossible, since one obligates and the other prohibits. But it is a matter of precaution. Yes, let us read.