Psalms 66:15

15 I will offer unto thee burnt-sacrifices of fatlings. We must suppose the speaker to be either David or one of the more considerable men of the nation, for none in humbler circumstances could have offered rich sacrifices of this kind. It is probable that David was the author of the psalm, and here he signifies his intention to show a kingly liberality in his offerings. The reason why God ordered victims to be offered as an expression of thanksgiving was, as is well known, to teach the people that their praises were polluted by sin, and needed to be sanctified from without. However we might propose to ourselves to praise the name of God, we could only profane it with our impure lips, had not Christ once offered himself up a sacrifice, to sanctify both us and our services. (Hebrews 10:7) It is through him, as we learn from the apostle, that our praises are accepted. The Psalmist, by way of commendation of his burnt-offering, speaks of its incense or sweet savor; for although in themselves vile and loathsome, yet the rams and other victims, so far as they were figures of Christ, sent up a sweet savor unto God. Now that the shadows of the Law have been abolished, attentionis called to the true spiritual service. What this consists in, is more clearly brought under our notice in the verse which follows, where the Psalmist tells us, that he would spread abroad the fame of the benefits which he had received from God. Such was the end designed, even in the outward ceremonies under the Law, apart from which they could only be considered as an empty show. It was this — the fact, that they set forth the praises of the divine goodness — which formed the very season of the sacrifices, preserving them from insipidity. In calling, as he does, upon all the fearers of the Lord, the Psalmist teaches us, that if we duly feel the goodness of God, we will be inflamed with a desire to publish it abroad, that others may have their faith and hope confirmed, by what they hear of it, as well as join with us in a united song of praise. He addresses himself to none but such as feared the Lord, for they only could appreciate what he had to say, and it would have been lost labor to communicate it to the hypocritical and ungodly.