Wherewith (hou). Literally, “where” (the wilderness) as in Deu 8:15.
Tempted me by proving me (epeirasan en dokimasiāi). No word for “me.” The Israelites “tested” God “in putting to the proof” (only N.T. use of this word from dokimazō and this from the lxx). They were not content with God’s promise, but demanded objective proof (erga, deeds) of God.