Husayn bin Abdul-Rahman reported,

I was sitting beside Umara bin Ruwayba while Bishr was delivering a sermon to us. When he made supplication, he raised both his hands.Umara said, "May Allah disfigure these two hands," or "these two little hands. I saw the Messenger of Allah ﷺ delivering a sermon, and when he made supplication, he would do like this," and he raised only his index finger.

حدثنا موسى بن داود حدثنا زهير

عن حصين بن عبد الرحمن السلمي قال

كنت إلى جنب عمارة بن رويبة وبشر يخطبنا فلما دعا رفع يديه فقال عمارة يعني قبح الله هاتين اليدين أو هاتين اليديتين رأيت رسول الله ﷺ وهو يخطب إذا دعا يقول هكذا ورفع السبابة وحدها