Psalms 4:5

Offer, to wit, unto God, that he may be reconciled to you, and may pardon all your murmurings and insurrections against him and against me. For it seems plain that this, as well as the former verse, is spoken not to David's friends and favourers, as some think, but to his enemies, even to those sons of men, Psalms 4:2, to whom he directeth his speech, Psalms 4:3, but know, and, Psalms 4:4, stand in awe and here offer: The sacrifices of righteousness, i.e. righteous sacrifices; which requires that the persons offering them be righteous, and do righteous things, and offer them with an honest mind, and with faith (as it follows) and true repentance; without which he intimates that all their sacrifices were of no esteem with God, and would be wholly unprofitable to them. And withal, it is probable that he reflects upon the followers of Saul or of Absalom, who had the only place of sacrifice in their possession, whilst David was debarred of the opportunity of sacrificing, as he complains, 1 Samuel 26:19; and accordingly they gloried in their sacrifices, and upon that account promised themselves success against David, who was by God's providence deprived of the opportunities of reconciling and engaging God by sacrifices. And put your trust in the Lord; and then, i.e. so doing, you may rely upon God, and confidently expect his assistance, which otherwise it is in vain for you to hope for. Withal, he seems to reflect upon his enemies, who trusted to an arm of flesh, to their own great numbers and power, and to intimate what his course was, to wit, to trust in the Lord.