Isaiah 33:2

O Lord, be gracious unto us The prophet and the pious Jews, contemplating the calamity coming upon their country, here direct their prayer unto God for themselves and their people. Be thou their arm That is, their strength, namely, the strength of all that trust in thee, and wait for thee, Psalms 25:3; every morning Hebrew, לבקרים, in the mornings; that is, every day seasonably and speedily; on all occasions as they need. In mentioning the mornings, the prophet is thought to refer to the time of the morning sacrifice, which was the morning hour of prayer with the pious Jews; but he includes all other times of prayer, in all which he desires God to hear and answer his people, and to be their salvation all the day long, and especially to support them in the time of trouble.