Al-Mu'jam al-Awsat 5931 — the Messenger of Allah ﷺ hesitated

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) hesitated and faltered while reciting a verse in the Fajr prayer (he (peace and blessings be upon him) became confused in reciting the verse). When he (peace and blessings be upon him) finished the prayer, he turned his face towards the people and asked: "Was Ubayy bin Ka'b present with you in this prayer?" They said: "No." Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The people understood that he (peace and blessings be upon him) had looked for him only so that he would prompt him (peace and blessings be upon him) (by reciting the verse to him).
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) only with this chain; Qays bin al-Rabi' is alone in it."