Sayyiduna Malik bin Huwairith (may Allah be pleased with him) reports: The Noble Prophet (peace and blessings be upon him) said: "When Allah wants to create a soul, a man has intercourse with his wife, and his fluid spreads from every vein and muscle. When the seventh day comes, Allah brings every vein between him and Adam (peace be upon him) present." Then he recited this verse: "In whatever form He willed, He assembled you."