Commentaries:
Jamieson, Fausset, and Brown
free spirit—"thy" ought not to be supplied, for the word "free" is, literally, "willing," and "spirit" is that of David. "Let a willing spirit uphold me," that is, with a soul willingly conformed to God's law, he would be preserved in a right course of conduct.
A series of prayers for forgiveness and purifying.
Purge . . . hyssop—The use of this plant in the ritual (Exodus 12:22; Numbers 19:6, Numbers 19:18) suggests the idea of atonement as prominent here; "purge" refers to vicarious satisfaction (Numbers 19:17-20).
Other Jamieson, Fausset, and Brown entries containing Psalms 51:12:
Job 33:27
Psalms 51:10
Ezekiel 18:31
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