(432) بَابُ تَحْرِيكِ الرَّأْسِ وَعَضِّ الشَّفَتَيْنِ عِنْدَ التَّعَجُّبِ
'Abdullah ibn as-Samit said, "I questioned my close friend AbuDharr who said, 'I brought some water for wudu' to the Prophet, may Allahbless him and grant him peace. He shook his head and bit his lip. I said,"May my father and mother be your ransom, have I injured you?" "No," hereplied, "but you will meet amirs ? or imams ? who will delay the prayeruntil it is past its time." "So what do you command me to do?" I asked.He replied, "Pray the prayer at the proper time. If you come across them,then pray with them and do not say, 'I have already prayed, so I will notpray again.'"'"
Reference: Al-Adab Al-Mufrad 954
In-book reference: Book 41, Hadith 3
English translation: Book 41, Hadith 954