Then said Micah, Now know I that the LORD will do me {i} good, seeing I have a Levite to my priest.

(i) Thus the idolaters persuade themselves of God's favour, when indeed he detests them.

Wesley's Notes

17:13 Do me good - I am assured God will bless me. So blind and grossly partial he was in his judgment, to think that one right circumstance would answer for all his substantial errors, in making and worshipping images against God's express command, in worshipping God in a forbidden place, by a priest illegally appointed.

Scofield Reference Notes

[1] Now know I

A striking illustration of all apostasy. With his entire departure from the revealed will of God concerning worship and priesthood, there is yet an exaltation of false priesthood. Saying, "Blessed be thou of Jehovah," Micah's mother makes an idol; and Micah expects the blessing of Jehovah because he has linked his idolatry to the ancient levitical order.

Jamieson-Fausset-Brown Bible Commentary

13. Now know I that the Lord will do me good-The removal of his son, followed by the installation of this Levite into the priestly office, seems to have satisfied his conscience, that by what he deemed the orderly ministrations of religion he would prosper. This expression of his hope evinces the united influence of ignorance and superstition.

Matthew Henry's Concise Commentary

17:7-13 Micah thought it was a sign of God's favour to him and his images, that a Levite should come to his door. Thus those who please themselves with their own delusions, if Providence unexpectedly bring any thing to their hands that further them in their evil way, are apt from thence to think that God is pleased with them.