It is narrated from Sayyida Busrah bint Safwan (may Allah be pleased with her), she heard the Messenger of Allah (peace and blessings be upon him) saying: "If a man touches his private part, he should perform ablution." That is, his ablution is broken, and he should renew his ablution for prayer.
It is narrated from Sayyida Busrah bint Safwan (may Allah be pleased with her) that she heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever touches his private part should perform ablution." Imam Darimi (may Allah have mercy on him) said: This is the most reliable narration regarding the private part.
Hadith Referenceسنن دارمي / من كتاب الطهارة / 748
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده ضعيف ولكن الحديث صحيح، [مكتبه الشامله نمبر: 752]
Hadith Takhrijیہ روایت اس سند سے ضعیف ہے، لیکن مذکورہ بالا سند صحیح ہے۔