Verse 15. - And call upon me in the day of trouble (comp. Psalm 20:1). I will deliver thee, and thou shalt glorify me. The meaning is, "Then, when thou shalt offer unto me a true worship (ver. 14), if thou wilt call upon me in the day of trouble, I will assuredly deliver thee, and so give thee occasion for glorifying me."

50:7-15 To obey is better than sacrifice, and to love God and our neighbour better than all burnt-offerings. We are here warned not to rest in these performances. And let us beware of resting in any form. God demands the heart, and how can human inventions please him, when repentance, faith, and holiness are neglected? In the day of distress we must apply to the Lord by fervent prayer. Our troubles, though we see them coming from God's hand, must drive us to him, not drive us from him. We must acknowledge him in all our ways, depend upon his wisdom, power, and goodness, and refer ourselves wholly to him, and so give him glory. Thus must we keep up communion with God; meeting him with prayers under trials, and with praises in deliverances. A believing supplicant shall not only be graciously answered as to his petition, and so have cause for praising God, but shall also have grace to praise him.And call upon me in the day of trouble,.... This is another part of spiritual sacrifice or worship, which is much more acceptable to God than legal sacrifices. Invocation of God includes all parts of religious worship, and particularly designs prayer, as it does here, of which God, and he only, is the object; and which should be performed in faith, in sincerity, and with fervency; and though it should be made at all times, in private and in public, yet more especially should be attended to in a time of affliction, whether of soul or body, whether of a personal, family, or public kind, James 5:13; and the encouragement to it is,

I will deliver thee: that is, out of trouble: as he is able, so faithful is he that hath promised, and will do it. The obligation follows,

and thou shall glorify me; by offering praise, Psalm 50:23; ascribing the glory of the deliverance to God, and serving him in righteousness and true holiness continually.