What is quality worship?
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The first is derived from God's instructions regarding holiness. The core idea of holiness in both the Old and New Testaments is "set-apartness." Whether it be food, days, vestments, utensils, places, offerings, or God's people themselves, to be holy is to be peculiar, dedicated to the Lord. To sanctify something is to set it apart as special for God. The "unholy" is thus not only what is profane but also what is ordinary or "common." God is holy and he desires his people to be holy. Everything we offer him is to be marked by its holiness. He expects us to demonstrate in every aspect of our relationship to him the special regard he deserves.
A second consideration is the biblical idea of "the firstfruits." This does not refer to any specific type of thing placed on the altar; rather it is a description of the quality of the offering: the choicest of the fruits, the firstborn. God demands that we give him our best. The people of Malachi's day dishonored the Lord by bringing him inferior worship offerings. They sniffed at God's expectations and said, "What a nuisance this is" (Mal. 1:13). Not surprisingly, God was incensed by their contemptuous, "anything will do" attitude toward worship. "Cursed is the cheat," he warned them, who has a suitable sacrifice but offers up something less. God requires our best in everything we bring him.
A third consideration is costliness. This has nothing to do with dollar amounts. The impoverished widow offered the Lord a tiny sum, but in Christ's estimation it amounted to "more … than all the others" (Mark 12:41–44). The point here, rather, is our willingness to expend ourselves sacrificially for the Lord's sake. This spirit of sacrifice was famously modeled by King David when he approached Araunah about purchasing his threshing floor as a place of worship (the future site of Solomon's temple, as it turned out). Araunah offered to donate not only the land but also his sledges and yokes for the wood and his oxen for sacrifices. But the king refused his gift. David would not offer to the Lord, he said, that which "cost me nothing" (2 Sam. 24:24). Instead, he bought the land at full price and then dedicated it to the Lord. It was a costly gift, one that proved acceptable to God.