Sahih al-Bukhari 6161
Sahih al-Bukhari · Book 78: Good Manners and Form (Al-Adab) · Saying "Wailaka."
Narrated Anas bin Malik:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا حَمَّادٌ ، عَنْ ثَابِتٍ الْبُنَانِيِّ ، عَنْ أَنَسِ بْنِ مَالِكٍ ،. وَأَيُّوبَ عَنْ أَبِي قِلاَبَةَ ، عَنْ أَنَسِ بْنِ مَالِكٍ ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي سَفَرٍ، وَكَانَ مَعَهُ غُلاَمٌ لَهُ أَسْوَدُ، يُقَالُ لَهُ أَنْجَشَةُ، يَحْدُو، فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " وَيْحَكَ يَا أَنْجَشَةُ رُوَيْدَكَ بِالْقَوَارِيرِ " .
Allah's Messenger (ﷺ) was on a journey and he had a black slave called Anjasha, and he was driving the camels (very fast, and there were women riding on those camels). Allah's Messenger (ﷺ) said, "Waihaka (May Allah be merciful to you), O Anjasha! Drive slowly (the camels) with the glass vessels (women)!"