The oil for the lamps of the tabernacle and the meal for the showbread were to be offerings from the Congregation, like the meal for the Pentecostal loaves, Leviticus 23:17. It appears that the responsibility of keeping up the lights rested on the high priest, but the actual service might be performed, on ordinary occasions, by the common priests. Compare margin reference.

And the Lord spake unto Moses,.... After he had delivered to him the laws concerning the purity of the priests, and the perfection of the sacrifices they were to offer, and concerning the feasts the people were to keep, he spoke to Moses of some other things which concerned both people and priests:
saying; as follows.

The loaves of bread typify Christ as the Bread of life, and the food of the souls of his people. He is the Light of his church, the Light of the world; in and through his word this light shines. By this light we discern the food prepared for our souls; and we should daily, but especially from sabbath to sabbath, feed thereon in our hearts with thanksgiving. And as the loaves were left in the sanctuary, so should we abide with God till he dismiss us.

The directions concerning the oil for the holy candlestick (Leviticus 24:1-4) and the preparation of the shew-bread (Leviticus 24:5-9) lose the appearance of an interpolation, when we consider and rightly understand on the one hand the manner in which the two are introduced in Leviticus 24:2, and on the other their significance in relation to the worship of God. The introductory formula, "Command the children of Israel that they fetch (bring)," shows that the command relates to an offering on the part of the congregation, a sacrificial gift, with which Israel was to serve the Lord continually. This service consisted in the fact, that in the oil of the lamps of the seven-branched candlestick, which burned before Jehovah, the nation of Israel manifested itself as a congregation which caused its light to shine in the darkness of this world; and that in the shew-bread it offered the fruits of its labour in the field of the kingdom of God, as a spiritual sacrifice to Jehovah. The offering of oil, therefore, for the preparation of the candlestick, and that of fine flour for making the loaves to be placed before Jehovah, formed part of the service in which Israel sanctified its life and labour to the Lord its God, not only at the appointed festal periods, but every day; and the law is very appropriately appended to the sanctification of the Sabbaths and feast-days, prescribed in ch. 23. The first instructions in Leviticus 24:2-4 are a verbal repetition of Exodus 27:20-21, and have been explained already. Their execution by Aaron is recorded at Numbers 8:1-4; and the candlestick itself was set in order by Moses at the consecration of the tabernacle (Exodus 40:25).