If Prophet Adam was blessed with two sons, Sheeth and Yafeth, from where did the two women who married them…

Answer

In the name of Allah, there are two narrations in our reliable books concerning this matter. One states that Allah sent two women from paradise, each married one, and progeny was produced. The second states that Adam (PBUH) was blessed with two sons and two daughters, and it was permissible for a brother to marry his sister according to Adam's (PBUH) law. Allah knows best.