Related for Megillah 50:12
תניא ר"ש בן אלעזר אומר לעולם יהא אדם זהיר בתשובותיו שמתוך תשובה שהשיבו אהרן למשה פקרו המערערים שנאמר (שמות לב, כד) ואשליכהו באש ויצא העגל הזה:
It has been taught: A man should always be careful in wording his answers, because from the answer which Aaron made to Moses the heretics denied God were able to deny [God], as it says, “And I cast it into the fire and this calf came forth” (Exodus 32:24).
Tosefta Megillah
One who leads the responsive recitation of the Shema, or blesses over fruit or over matzah, behold, he should not answer "amen" after himself. If he answered ["amen" after his own prayer], behold, this is how ignoramuses act. We do not answer with either an "orphaned amen" (i.e., where one does not know to what blessing he is saying "amen"), or a "truncated [amen]" (i.e., where one does not pronounce the entire word). Ben Azzai says, one who answers with an "orphaned amen" -- his children will be orphaned; with a "truncated [amen]," his days will be truncated. But whoever prolongs [his amen], his days and years will be prolonged.
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