Hadith.5375 - Yunus ibn Abd Al-Rahman narrated from Abdullah ibn Sinan, who narrated from Abu Abdullah (as), who said: I asked Imam (as) about a man who married a woman, and on the night of consummation, the woman brought in a male friend of hers and let him enter the bridal chamber. When the husband approached to be intimate with his wife, the friend suddenly attacked him, and they fought in the house until the husband killed the friend. Then the woman struck the husband and killed him because of her friend. Imam (as) said: "The woman must pay the blood money for her (male) friend, and she is to be executed for killing her husband."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.