And call upon me in the day of trouble: I will deliver thee, and thou shalt glorify me.

Wesley's Notes

50:15 Call - And make conscience of that great duty of fervent prayer, which is an acknowledgment of thy subjection to me, and of thy trust and dependance upon me. Glorify - Thou shalt have occasion to glorify me for thy deliverance.

Matthew Henry's Concise Commentary

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.