Sayyiduna Alqamah bin al-Fagwa' (may Allah be pleased with him) narrates: When the Prophet (peace and blessings be upon him) urinated, we would speak to him (that is, say something to him), but he would not speak to us; we would greet him with salam, but he would not return our greeting, until he went to his house and performed ablution like the ablution for prayer. We said: "O Messenger of Allah! We spoke to you but you did not speak to us, and we greeted you with salam but you did not reply to us." The narrator says: Until the verse of concession was revealed: "O you who believe! When you stand up for prayer"
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir; the chain of this report contains a narrator, Jabir al-Ju'fi, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1510