Prohibition of using ejaculation of foreign men
Prophet Muhammad (s.) said: “No sin is more immense with God than a drop [nutfah, synonym for seed] that you place in a womb that is not permitted to you.” [Mustadrak-ul-Wasa’il, volume 14 page 336, Hadith 16879]
ما من ذنب أعظم عند الله من نطفة يضعها الرجل في رحم لا يحل له
Prophet Muhammad (s.) said: “The son of Adam did not commit a more immense act than someone, who murdered a Prophet or Imam or leveled the Ka’bah, which God set as the direction of prayer for His servants, or placed his liquid in a woman, which is forbidden.” [Mustadrak-ul-Wasa’il, volume 14 page 336 Hadith 16878]
لم يعمل ابن آدم عملا أعظم عند الله تعالى من رجل قتل نبيا أو إماما، أو هدم الكعبة التي جعلها الله قبلة لعباده، أو أفرغ ماءه في امرأة حرام
Prophet Muhammad (s.) said: “The one among the people, who will be punished the most severely on the Day of Resurrection, is the one who put a drop in a womb, that is forbidden to him.” [Mustadrak-ul-Wasa’il, Volume 14 page 335 Hadith 16875]
أن رسول الله (صلى الله عليه وآله)، قال، في حديث: وأشد الناس عذابا يوم القيامة، من أقر نطفة في رحم محرم عليه