Now she that is a widow indeed,.... A real widow, whom the Jews call hrwmg, "a perfect one", in opposition to one that is divorced, or a brother's widow, that has had the shoe plucked off for her: and such an one as the apostle means, is one that isdesolate, or "alone": who has neither husband to take care of her, nor children or nephews to show kindness to her, nor any worldly substance to subsist upon:but trusteth in God: not in man, nor in an arm of flesh, but in the living God, the giver of all good things, the Judge of widows; who vindicates their cause, avenges the injuries done them, protects and defends them, and relieves their wants, and gives all encouragement to them, to trust in him; see Jer 49:11.
and continueth in supplications and prayers night and day; as the widow Anna did, Lu 2:36. A Widow indeed is one that has no outward dependence, betakes herself to the Lord, puts her confidence in him, and cries to him continually for a daily supply; and such an one, amidst all her poverty and meanness, is a living believer, one that lives by faith on the Lord; and is profitable, and useful to the church by her prayers and supplications made for them, as well as for herself; whereas she that is in the next verse described is just the reverse.
Jarchi in Exek. xliv.