A man was supplicating with two fingers, so the Messenger of Allah ﷺ said, "One, one."
أخبرنا محمد بن بشار قال حدثنا صفوان بن عيسى قال حدثنا ابن عجلان عن القعقاع عن أبي صالح
أن رجلا كان يدعو بأصبعيه فقال رسول الله ﷺ أحد أحد
[Its chain of transmission is daif] Tirmidhi narrated it in the chapter on supplications, chapter "Indeed Allah is Huyayy, Kareem...", hadith no. 3557, from Muhammad bin Bashshar with this wording, and he said, hasan sahih gharib. It is also found in Kubra, hadith no. 1195. Hakim and Dhahabi graded it sahih.Ibn Ajlan reported it using "an" (without stating direct hearing), as mentioned earlier at 1271. The basic hadith has many corroborating reports, so see the following hadith.