This feast was to be kept with sacrificial gifts according to the measure of the free-will offerings of their hand, i.e. voluntary offerings which they gave as the Lord had blessed them; nothing was specially prescribed, each was to give of his own free-will as the Lord had prospered him.
The word translated "tribute" in the Authorized Version ( מִסַּת) occurs only here, and is of doubtful signification. The LXX. render it by καθὼς, as, according to; it is identical with the Aramaic מסת sufficiency, enough, and may be understood here of the full measure according to which their offerings were to be presented.
The freewill offering of thine hand, here referred to, belonged to the gifts of burnt offerings, meat offerings, drink offerings, and thank offerings which might be offered at every feast along with the sacrifices prescribed (of.
Le 23:38; Numbers 29:39). Of the latter no mention is made here, as the law regarding them was already sufficiently proclaimed (Numbers 28:1-31 and Numbers 29:1-40.); and in a popular address it was rather to what depended on the will of the people than to what was imperative by law, that attention had to be directed.