Hadith 229

Bulugh al-Maram

Book 2: The Book of Prayer
وَلِأَبِي دَاوُدَ , فَقَالَ : { أَصَدَقَ ذُو اَلْيَدَيْنِ ? " فَأَوْمَئُوا : أَيْ نَعَمْ } .‏ 1‏
And in Abu Dawud:

"He said, 'Has Dhul-Yadain spoken the truth?' Then they said 'Yes' with gesture".