137 – ʿAmmar ibn Naṣr narrated to us: Bakiyyah informed us, from Abū Bakr ibn ʿAbd Allāh ibn Abī Maryam, from al-Haytham ibn Mālik al-Ṭāʾī, who said: The Messenger of Allah (peace and blessings be upon him) said, “After shirk—associating partners with Allah—no sin is greater in Allah’s sight than a man depositing his seed in a womb that is not lawful for him.”