It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every one of the children of Adam will meet Allah Almighty on the Day of Resurrection with some sin or other that he committed, for which Allah will punish him if He wills or have mercy on him if He wills, except Sayyiduna Yahya bin Zakariyya (peace be upon them both), for he was a leader, one who restrained himself (from his desires), and a prophet from among the righteous." Then the Prophet (peace and blessings be upon him) bent down towards a twig lying on the ground, picked it up and said: "His private organ was like this twig."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Muhammad bin Ajlan (may Allah have mercy on him) except al-Layth (may Allah have mercy on him); Hajjaj bin Sulayman (may Allah have mercy on him) is alone in narrating it from al-Layth (may Allah have mercy on him), and Muhammad bin Salamah al-Muradi (may Allah have mercy on him) is alone in narrating it from Hajjaj."
Hadith Referenceالمعجم الأوسط / باب الميم / 6556
Hadith Gradingمحدثین:إسناده ضعيف، فيه حجاج بن سليمان الرعيني مختلف فيه
Hadith Takhrij«قال الهيثمي: وفيه حجاج بن سليمان الرعيني وثقه ابن حبان وغيره وضعفه أبو زرعة وغيره وبقية رجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 8، ص 209»» «قال أبو حاتم الرازي: لم يكن هذا الحديث عند أحد غير الحجاج ولم يكن في كتاب الليث وحجاج هذا هو شيخ معروف «علل الحديث، ج 5، ص 101»» «قال ابن عدي: يحدث عن الليث وابن لهيعة أحاديث منكرة «الكامل في الضعفاء، ج 2، ص 536»»