Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.036A.

Busrah bint Safwan narrated that the Prophet, upon whom be peace, said, “Whoever touches his sexual organ cannot pray until he performs ablution.”

This hadith is related by “the five.” At-Tirmizhi classified it as sahih and al-Bukhari called it the most authentic report on that topic. Malik, ash-Shaifi, Ahmad and others also narrated it. Abu Dawud said, “I asked Ahmad, ‘Is the hadith of Busrah authentic?’ He said, ‘Certainly it is authentic.” In the narration of Ahmad and an-Nasa’i, Busrah heard the Prophet saying, “Ablution is to be made by the one who touches his sexual organ.” This is general and encompasses touching one’s own sexual organs or touching somebody else’s. Abu Hurairah reported the Prophet as saying, “Whoever touches his sexual organ without any covering (between them) must perform ablution.” (Related by Ahmad, Ibn Hibban and al-Hakim, who classified it as sahih, as did Ibn ‘Abdul-Barr.)

Said Ibn as-Sakin, “That hadith is from the best of what has been related on this topic.” Ash-Shaf’i related: “Any man who touches his penis must perform ablution. Any women who touches her vagina must perform ablution.” Commenting on its authenticity, Ibn alQayyim quotes al-Hazimi who says, “That chain is sahih.” The Hanifiyyah are of the opinion, based on the following hadith, that touching the sexual organ does not nullify the ablution: “A man asked the Prophet if a man who touches his penis has to perform ablution. Said the Prophet, upon whom be peace, “No, it is just a part of you.” (Related by “the five.” Ibn Hibban classified it as sahih, and Ibn al-Madini said, “It is better than the hadith of Busrah.”)