עֵ֤דוּת ׀ בִּֽיה֘וֹסֵ֤ף שָׂמ֗וֹ בְּ֭צֵאתוֹ עַל־אֶ֣רֶץ מִצְרָ֑יִם שְׂפַ֖ת לֹא־יָדַ֣עְתִּי אֶשְׁמָֽע׃
하나님이 애굽 땅을 치러 나가시던 때에 요셉의 족속 중에 이를 증거로 세우셨도다 거기서 내가 알지 못하던 말씀을 들었나니
Rashi on Psalms
As a testimony for Jehoseph He ordained it On Rosh Hashanah, Joseph went out of prison.
Rashi on Psalms
[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.