Reference for Megillah 5:18

ועבודה חמורה מתלמוד תורה והכתיב (יהושע ה, יג) ויהי בהיות יהושע ביריחו וישא עיניו וירא והנה איש עומד לנגדו [וגו'] וישתחו (לאפיו)

But is the [Temple] service more important than the study of the Torah? Surely it is written, “And it came to pass when Joshua was by Jericho, that he lifted up his eyes and looked, and behold there stood a man over against him, . . . and he fell on his face” (Joshua 5:13).

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