(37) باب النَّهْىِ عَنِ الإِشَارَةِ، بِأُصْبُعَيْنِ وَبِأَىِّ أُصْبُعٍ يُشِيرُ
It was narrated from Abu Hurairah that:
A man used to supplicate with two fingers and the Messenger of Allah (ﷺ) said: "Make it one, make it one."
Reference: Sunan an-Nasa'i 1272
In-book reference: Book 13, Hadith 94
English translation: Vol. 2, Book 13, Hadith 1273