As at this day - i. e. "as ye are now doing, in coming with pious intentions to this festival."

Let your heart therefore be perfect - Be sincere in your faith, be irreproachable in your conduct.

Let your heart therefore be perfect with the Lord your God,.... Sincere in their love to him, united in their worship of him, and constant in their obedience to him:

to walk in his statutes, and to keep his commandments, as at this day: as they did that day, neither king nor people having as yet fallen into idolatry, but showing by their then present appearance a zeal for God, his house, and worship.

Let your heart be יי עם שׁלם, wholly, undividedly devoted to the Lord (cf. 1 Kings 11:4; 1 Kings 15:3, 1 Kings 15:14, etc.).

Let your heart therefore be perfect with the LORD our God, to walk in his statutes, and to keep his commandments, as at this day.

8:61 Perfect - Let your obedience be universal, without dividing; upright, without dissembling; and constant, without declining.

Margin perfect

The word implies whole-heartedness for God, single-mindedness, sincerity -- not sinless perfection.

8:54-61 Never was a congregation dismissed with what was more likely to affect them, and to abide with them. What Solomon asks for in this prayer, is still granted in the intercession of Christ, of which his supplication was a type. We shall receive grace sufficient, suitable, and seasonable, in every time of need. No human heart is of itself willing to obey the gospel call to repentance, faith, and newness of life, walking in all the commandments of the Lord, yet Solomon exhorts the people to be perfect. This is the scriptural method, it is our duty to obey the command of the law and the call of the gospel, seeing we have broken the law. When our hearts are inclined thereto, feeling our sinfulness and weakness, we pray for Divine assistance; thus are we made able to serve God through Jesus Christ.