Marrying the sons of a tribe exclusively from within their own tribe

The questioner:
I said: Honorable Shaykh, may Allah preserve you, among the customs of some tribes regarding marriage is that they do not marry their daughters off except to someone from their own tribe, or as they say, someone who is a tribal member. Is this one of the matters of the pre-Islamic age of ignorance (jahiliyyah) that should be rejected?

The Shaykh:
As for the fact that they do not marry off their daughters except to someone from their own tribe, this is the most correct thing. The Prophet (peace and blessings be upon him) said: "When there comes to you a man whose religion and trustworthiness you are pleased with, then marry him to her" lest there be corruption. This applies whether he is from their tribe or from another tribe. As for the issue of difference in lineage, this is a matter of tribal affiliation here; they do not marry off except to a tribal member. This is considered a matter of compatibility (kafa'ah). The scholars have counted this as part of compatibility. If the woman is pleased with him and the guardian is pleased with him, there is no harm. However, if they are not pleased, then this is considered a matter of compatibility.