Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whoever extends his hand to his private part with no covering over it, ablution becomes obligatory upon him."
Ahmad recorded it, al-Tabarani in al-Mu'jam al-Awsat and al-Mu'jam al-Saghir, and al-Bazzar. Its chain contains a narrator, Yazid bin Abd al-Malik al-Nawfali, whom most people declared da'if (weak), while according to one report Yahya bin Ma'in declared him thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1265
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه مسند أحمد برقم: 8199، وأخرجه المعجم الأوسط للطبراني برقم: 6664، 8829، 8904، وأخرجه المعجم الصغير للطبراني برقم: 97»