Psalms 105:19: Verse 19
Until the time that his word came - This appears to refer to the completion of Joseph's interpretation of the dreams of the chief butler and baker.
The Word of the Lord tried him - This seems to refer to the interpretation of Pharaoh's dreams, called אמרת יהוה imrath Yehovah, "the oracle of the Lord," because sent by him to Pharaoh. See Gen 41:26, and Kennicott in loco.