John Calvin Commentary Psalms 27:6

"And now shall my head be lifted up above mine enemies round about me. And I will offer in his tabernacle sacrifices of joy; I will sing, yea, I will sing praises unto Jehovah." — Psalms 27:6 (ASV)

And I will offer sacrifices of triumph in his tabernacle. By making a solemn vow of thanksgiving, after he has been delivered from dangers, he confirms himself again in the hope of deliverance. The faithful under the Law, we know, were accustomed, by a solemn rite, to pay their vows, when they had experienced any remarkable blessing from God. Here, therefore, David, though in banishment, and prohibited from approaching the temple, boasts that he would again come to the altar of God, and offer the sacrifice of praise. It appears, however, that he tacitly sets the holy rejoicing and songs, in which he promises to give thanks to God, in opposition to the profane triumphs of the world.