Yoma 6A

אמר לך: ההוא אבנטו של כהן גדול לא זה הוא אבנטו של כהן הדיוט.

The Talmud answers that he could have said to you: That verse comes to teach that the belt of the High Priest is not the belt of the common priest. It is explicit in the Torah that the belt of the High Priest is made of fine blue and purple linen. On the other hand, the Torah does not state the materials used in the belt of the common priest, which was in fact linen like the rest of the garments of the common priest. And still one can say that Aaron and his sons were dressed simultaneously.

ולמאן דאמר אהרן ואחר כך בניו, והכתיב: ״וחגרת אותם אבנט״! אמר לך: ההוא קא משמע לן, אבנטו של כהן גדול זהו אבנטו של כהן הדיוט.

The Talmud asks: And according to the one who said that Moses dressed Aaron first and then his sons, is it not written: “And you will gird them with belts,” indicating that they were girded simultaneously? The Talmud responds that he could have said to you: That verse teaches us that the belt of the High Priest is identical to the belt of the common priest. Both of them were from fine blue and purple linen. Therefore, although the Torah distinguishes between the girding of the belts, as Moses dressed Aaron before he dressed Aaron’s sons, there was a common command to make both belts, indicating that they were made of the same material.

״ויחגור אותו אבנט״ ״ויחגור אותם״ למה לי? שמע מינה אהרן ואחר כך בניו. ובבת אחת מי משכחת לה? לא צריכא, דאקדים.

The Talmud asks: If they are identical, why do I need both the verse: “And he girded him with a belt,” and the verse: “And he girded them”? The Talmud explains: Learn from it that Moses dressed Aaron first and then dressed his sons. The Talmud asks: And can you find a situation where Moses could have girded Aaron and his sons simultaneously? The Talmud explains: It is necessary only to state that Moses girded Aaron first and then proceeded to gird his sons in order of their significance. After girding Aaron he did not dress Aaron in any other garments before girding his sons.