(37) باب النَّهْىِ عَنِ الإِشَارَةِ، بِأُصْبُعَيْنِ وَبِأَىِّ أُصْبُعٍ يُشِيرُ
It was narrated from Sa`d who said:
"The Messenger of Allah (ﷺ) passed by me when I was supplicating with my fingers and he said: 'Make it one, make it one' and pointed with his forefinger."
Reference: Sunan an-Nasa'i 1273
In-book reference: Book 13, Hadith 95
English translation: Vol. 2, Book 13, Hadith 1274