Sefer Chasidim Siman 1142
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מה ששליח צבור מתפלל ומסדר תפלתו עם הצבור כדי שתהא שגורה בפיו כר' חנינא בן דוסא כשהיתה תפלתו שגורה בפיו היה מקובל:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
It is proper that the prayer of a prayer leader should be fluent in his mouth like in a case of R. Chanina ben Dosa of whom it is said that whenever his prayer was fluent in his mouth this indicated Heaven's benevolence.