# David went up
This is a reference to elevation. This threshing floor which became the future site of the temple was the highest point in Jerusalem.
# as Gad instructed him to do in the name of Yahweh
Speaking "in the name of Yahweh" means speaking with his power and authority, or as his representative. Alternate translation: "as Gad, speaking for Yahweh, instructed David to do" (See: [[rc://en/ta/man/translate/figs-metonymy]])