We were in the company of the Messenger of Allah (ﷺ), and he sent me on an errand, and when I came back (I saw him) saying prayer on his ride and his face was not turned towards Qibla. I greeted him but he did not respond to me. As he completed the prayer, he said: Nothing prevented me from responding to your greeting but the fact that I was praying.
Reference: Sahih Muslim 540 c In-book : Book 5, Hadith 47 USC-MSA web (English) : Book 4, Hadith 1102 (deprecated)
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