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Shiavault - a Vault of Shia Islamic Books Children in the Qur’an and Sunnah Chapter 2: Heredity 2.1: Blood is Contagious 51. The Prophet (s.a.w.) said: “Look into what the origin of the womb is that you are going to put your child in, as indeed blood[^1] is contagious.”[^2] 52. The Prophet (s.a.w.) said: “People are [like] minerals; and blood is contagious and having bad manners is like a bad origin.”[^3] 53.

The Prophet (s.a.w.) said: “Marry from a righteous family because indeed blood is contagious.”[^4] 54. The Prophet (s.a.w.) said: “Choose [the womb] for your sperm, for indeed women bear children that are similar to their brothers and sisters.”[^5] 55. Imam ‘Ali (a.s.) said: “Beware of marrying a fool, for her companionship is disaster and her children are a loss.”[^6] 56.

Imam ‘Ali (a.s.) said: “A man from the Ansar came to the Messenger of Allah (s.a.w.) and said: “O Messenger of Allah (s.a.w.)!

This is my uncle’s daughter, and I am so and so, son of so and so –until he mentioned up to ten of his forefathers-, and she is so and so, daughter of so and so –also mentioning up to ten of her forefathers-, and there is no black person in my ancestors nor in her ancestors, but she has given birth to a black child!” The Messenger of Allah (s.a.w.) cast down his head for a long while, and then he raised his head and said: “Verily, you have ninety nine blood-veins [genes] and she also has ninety nine blood-veins.

When you copulate with her, the blood-veins will move and every blood-vein asks Allah Almighty for the child should be similar to it.