עַד־עֵ֥ת בֹּֽא־דְבָר֑וֹ אִמְרַ֖ת יְהוָ֣ה צְרָפָֽתְהוּ׃
Until the time that his word came to pass, The word of the LORD tested him.
Rashi on Psalms
Until His word came [The word] of the Holy One, blessed be He, to fulfill His decree that the matter should “roll” and Israel should descend to Egypt.
Rashi on Psalms
the saying of the Lord purified him It tried Joseph, for he was tested and he overcame the temptation [to sin] with his master’s wife, and he was tortured because of her and purified with tortures to place him in the dungeon.