Colossians 4:2

If this be considered as connected with the foregoing verse, then we may observe that it is part of the duty which masters owe their servants to pray with them, and to pray daily with them, or continue in prayer. They must not only do justly and kindly by them, but act a Christian and religious part, and be concerned for their souls as well as their bodies: "As parts of your charge, and under your influence, be concerned for the blessing of God upon them, as well as the success of your affairs in their hands." And this is the duty of every one - to continue in prayer. "Keep up your constant times of prayer, without being diverted from it by other business; keep your hearts close to the duty, without wandering or deadness, and even to the end of it: Watching the same." Christians should lay hold of all opportunities for prayer, and choose the fittest seasons, which are least liable to disturbance from other things, and keep their minds lively in the duty, and in suitable frames. - With thanksgiving, or solemn acknowledgment of the mercies received. Thanksgiving must have a part in every prayer. - Withal praying also for us, Col 4:3. The people must pray particularly for their ministers, and bear them upon their hearts at all times at the throne of grace. As if he had said, "Do not forget us, whenever you pray for yourselves," Eph 6:19; Th1 5:25; Heb 13:18.

— Matthew Henry's Concise Commentary (public domain)

Continue--Greek, "Continue perseveringly," "persevere" (Eph 6:18), "watching thereunto"; here, "watch in the same," or "in it," that is, in prayer: watching against the indolence as to prayer, and in prayer, of our corrupt wills. with thanksgiving--for everything, whether joyful, or sorrowful, mercies temporal and spiritual, national, family, and individual (Co1 14:17; Phi 4:6; Th1 5:18).

— Jamieson-Fausset-Brown Commentary (public domain)