Jami` at-Tirmidhi 3557
جامع الترمذي#3557Da'ifAbu Hurairah narrated that:A man was supplicating with his two fingers so the Messenger of Allah (ﷺ) said: “Make it one, make it one.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan Sahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan
Zubair Ali ZaiDaif
In-book reference: 48:188