Charles Ellicott Commentary 1 Chronicles 29:17

"I know also, my God, that thou triest the heart, and hast pleasure in uprightness. As for me, in the uprightness of my heart I have willingly offered all these things: and now have I seen with joy thy people, that are present here, offer willingly unto thee." — 1 Chronicles 29:17 (ASV)

You test the heart. —Psalms 11:4; Psalms 7:9; Psalms 26:2.

Take pleasure in. — 1 Chronicles 28:4; 1 Chronicles 29:3. (Compare also 1 Chronicles 28:9.)

Uprightness. —Or, sincerity (mêshârîm,Song of Solomon 1:4).

In the uprightness (yôsher), integrity (Deuteronomy 9:5), a synonym of mêshârîm. Both literally mean straightness: e.g., of a road (Proverbs 2:13; Proverbs 23:31).

The connection of ideas is this: You who look upon the heart know that my offering has been made without grudging and without hypocrisy; my motive was not my own interest, but Your glory. Hence my joyful thanksgiving, because of the free generosity of Your people.

Which are present here. —Literally, Who have found themselves here (reflexive verb). (So 2 Chronicles 5:11, and other places.)