# set all these apart

The phrase "set apart" means to be dedicated to a specific purpose. In this case, the offerings were dedicated to Yahweh. (See: [[rc://en/ta/man/jit/figs-idiom]])

# on the day that Moses anointed the altar

Here the word "day" refers to a general period of time. The leaders of Israel dedicated these things over the course of 12 days. Alternate translation: "when Moses anointed the altar"