C. F. Keil and Franz Delitzsch on 1 Chronicles 29:14

1Ch 29:14

For man of himself can give nothing: “What am I, and what is my people, that we should be able to show ourselves so liberal?” כּוח עצר כּוח, to hold strength together; both to have power to do anything (here and 2Ch 2:5; 2Ch 22:9), and also to retain strength (2Ch 13:20; Dan 10:8, Dan 10:16; Dan 11:6), only found in Daniel and in the Chronicle. התנדּב, to show oneself willing, especially in giving. כּזאת refers to the contribution to the building of the temple (1Ch 29:3-8). From Thy hand, i.e., that which is received from Thee, have we given.