Albert Barnes Commentary Psalms 69:9

"For the zeal of thy house hath eaten me up; And the reproaches of them that reproach thee are fallen upon me." — Psalms 69:9 (ASV)

For the zeal of thine house hath eaten me up - My zeal—my ardor—in the cause of religion (that is, of your pure worship) has been so great as to consume me. It has been like a devouring fire within me. Zeal is represented under the idea of heat—as it is in the Greek language—and the characteristics of heat or fire are here applied to it. This passage is quoted in John 2:17 and applied to the Saviour, not because it originally referred to him, but as language that would accurately describe his character. See the notes at that passage.

And the reproaches of them that reproached thee are fallen upon me - This, too, is applied, in the same way, to the Saviour, by the Apostle Paul, in Romans 15:3. See the notes at that passage.