David's refusal of a free gift might seem strange. But it highlights a beautiful interplay between the giver, the receiver, and God.
Respecting the Giver
Araunah's offer was incredibly generous, reflecting his own heart towards David and, indirectly, towards God. However, David, as king and as a worshiper of the LORD, recognized that accepting such a significant sacrifice for free would dishonor the sacred act of worship itself. He wanted the offering to be unequivocally his to God.
The Price of Obedience
By paying a fair price, David not only ensures the offering is meaningful but also honors Araunah's position and the value of his property. This act of purchasing the threshing floor and oxen for fifty shekels of silver demonstrates David's respect for God's commands and the seriousness with which he approached the atonement required for the nation's sin.