עֵ֤דוּת ׀ בִּֽיה֘וֹסֵ֤ף שָׂמ֗וֹ בְּ֭צֵאתוֹ עַל־אֶ֣רֶץ מִצְרָ֑יִם שְׂפַ֖ת לֹא־יָדַ֣עְתִּי אֶשְׁמָֽע׃
他在約瑟身上立此為證，那時他出去管理埃及地；我聽見我所不曉得的言語。
Rashi
As a testimony for Jehoseph He ordained it On Rosh Hashanah, Joseph went out of prison.
Rashi
[when] I understood a language that I had not known It is explained in tractate Sotah (36b) that [the angel] Gabriel taught him seventy languages.