Sahih al-Bukhari 4426
Sahih al-Bukhari · Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · The letter of the Prophet (saws) to Kisra (Khosrau) and Qaiser (Caesar)
Narrated As-Sa'ib bin Yazid:
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ ، حَدَّثَنَا سُفْيَانُ ، قَالَ سَمِعْتُ الزُّهْرِيَّ ، عَنِ السَّائِبِ بْنِ يَزِيدَ ، يَقُولُ أَذْكُرُ أَنِّي خَرَجْتُ مَعَ الْغِلْمَانِ إِلَى ثَنِيَّةِ الْوَدَاعِ نَتَلَقَّى رَسُولَ اللَّهِ صلى الله عليه وسلم. وَقَالَ سُفْيَانُ مَرَّةً مَعَ الصِّبْيَانِ .
I remember that I went out with the boys to (the place called) Thaniyat-ul-Wada` to receive Allah's Apostle .