Musar zu Dewarim 25:7

And thus is it stated (Yevamoth 105b): "R. Chiyya and R. Shimon ben Rebbi were sitting [in the house of study] … R. Yishmael ben R. Yossi came to them … In the interim, Rebbi came to the academy [and all had to sit in their places]. These (R. Chiyya and R. Shimon], who were agile, [quickly] sat in their places; R. Yishmael ben R. Yossi, being heavy, had to step [over those who were seated to get to his place], whereupon Avdan called out: 'Who is this that steps over the heads of the holy people!' R. Yishmael: 'I, Yishmael ben R. Yossi, who has come to learn Torah from the mouth of Rebbi!' Avdan: 'Are you worthy of learning Torah from the mouth of Rebbi!' R. Yishmael: 'And was Moses worthy of learning Torah from the Almighty?' Avdan: 'Are you Moses!' R. Yishmael: 'Is your teacher [(Rebbi)] G-d!' …In the interim, a yevamah [a woman slated for levirate marriage] came before Rebbi for chalitzah [release from levirate marriage], whereupon he said to Avdan: 'Go and have her examined' [for pubertal signs (to see if she is fit for chalitzah)]. At this, R. Yishmael b. Yossi said: [This is not necessary.] 'Thus did father say: "The man" is stated by Scripture in the section [on chalitzah (Devarim 25:7)], but as far as the woman is concerned, whether she be grown or a minor [the chalitzah is valid].'" Hereupon, Rebbi called Avdan back, saying: 'It is not necessary [to examine her]; the elder [R. Yossi] has already ruled.' As Avdan stepped [over those who were seated to return to his place], R. Yishmael ben R. Yossi said to him: 'Let him of whom the holy people have need step over the heads of the holy people; but how should he of whom the holy people have no need step over the heads of the holy people!' — whereupon Rebbi said to Avdan: 'Remain in your place.' It was taught: 'At that time, Avdan was smitten with leprosy [(the punishment for lashon hara)], his two sons drowned, and his two daughters-in-law [(who had been betrothed when minors)] had their marriage annulled."