Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "By the One in whose Hand is my soul, if the sperm-drop from which Allah Almighty has taken the covenant were cast onto a rock, Allah Almighty would create a human being even from it."
Al-Tabarani recorded it in al-Mu'jam al-Awsat, and its chain contains a narrator whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب النكاح / 7575
Hadith Gradingمحدثین:إسناده ضعیف
Hadith Takhrij«أخرجه المعجم الأوسط للطبراني برقم: 6880»