Offer unto God thanksgiving; and pay thy vows unto the most High: Offer unto God thanksgiving; and pay thy vows unto the Most High - זבח zebach, "sacrifice unto God, אלהים Elohim, the תודה todah, thank-offering," which was the same as the sin-offering, viz. a bullock, or a ram, without blemish; only there were, in addition, "unleavened cakes mingled with oil, and unleavened wafers anointed with oil; and cakes of fine flour mingled with oil and fried," Leviticus 7:12.
And pay thy vows - נדריך nedareycha, "thy vow-offering, to the Most High." The neder or vow-offering was a male without blemish, taken from among the beeves, the sheep, or the goats. Compare Leviticus 22:19 with Psalms 50:22. Now these were offerings, in their spiritual and proper meaning, which God required of the people: and as the sacrificial system was established for an especial end - to show the sinfulness of sin, and the purity of Jehovah, and to show how sin could be atoned for, forgiven, and removed; this system was now to end in the thing that it signified, - the grand sacrifice of Christ, which was to make atonement, feed, nourish, and save the souls of believers unto eternal life; to excite their praise and thanksgiving; bind them to God Almighty by the most solemn vows to live to him in the spirit of gratitude and obedience all the days of their life. And, in order that they might be able to hold fast faith and a good conscience, they were to make continual prayer to God, who promised to hear and deliver them, that they might glorify him, Psalms 50:15.
From the Psalms 50:16 to the Psalms 50:22 Asaph appears to refer to the final rejection of the Jews from having any part in the true covenant sacrifice.