Abu Dawood: Hadith 779

Samurah ibn Jundub and Imran ibn Husayn had a discussion (about the periods of silence in prayer). Samurah then said that he remembered two periods of silence from the Messenger of Allah (ﷺ); one when he uttered the takbir and the other when he finished reciting: "Not of those with whom You are angry, nor of those who go astray" (1:7).

Samurah remembered that, but Imran ibn Husayn rejected it.

Then they wrote about it to Ubayy ibn Ka'b. He wrote a letter to them and gave a reply to them that Samurah remembered correctly.