وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لِعَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ ‏"‏ كَيْفَ صَنَعْتَ يَا أَبَا مُحَمَّدٍ فِي اسْتِلاَمِ الرُّكْنِ ‏"‏ ‏.‏ فَقَالَ عَبْدُ الرَّحْمَنِ اسْتَلَمْتُ وَتَرَكْتُ ‏.‏ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَصَبْتَ ‏"‏ ‏.‏

Yahya related to me from Malik from Hisham ibn Urwa that hisfather said that the Messenger of Allah, may Allah bless him and granthim peace, once said to Abd ar-Rahman ibn Awf, "What do you do, AbuMuhammad, when saluting the corner?" and Abd ar-Rahman said,"Sometimes I salute it, and sometimes I don't." The Messenger ofAllah, may Allah bless him and grant him peace, said, "You are right." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 817
Web Ref:  Muwatta Imam Malik Book 20 Hadith 114