Isaiah 12:4

“In that day shall ye say, praise the Lord, &c.] On account of his being and perfections, for blessings received from him, especially spiritual ones; and particularly such as are before mentioned, fulness of grace in him, strength and salvation by him, a view of interest in him as a Saviour, and divine comforts communicated from him; which is done by giving him the glory of them, and thanks for them. This is a work very proper for Gospel times; it always was a duty, and there was ever reason for it under the former dispensation, and much more under the present one; and there will be still more reason for it in the latter day here referred to, when antichrist will be destroyed, the kingdom of…”

“make mention--Hebrew, "cause it to be remembered."”

“And in that day - (see Isaiah 12:1). Call upon his name - Margin, ‘Proclaim.’ It denotes to call upon him in the way of celebrating his praise. The whole hymn is one of praise, and not of prayer. Declare among the people - Among all people, that they may be brought to see his glory, and join in the celebration of his praise. His doings - Particularly in regard to the great events which are the subject of the previous predictions - his interposition in saving people by the Messiah from eternal death. Make mention - Hebrew, ‘Cause it to be remembered’ (see the note at Isaiah 62:6). That his name is exalted - That it is worthy of adoration and praise. It is worthy to be exalted, or lifted up in…”

“12:4-5 Tell the nations what he has done: The story of salvation must be told, even beyond the community of Israel (Pss 67:2; 70:4; 98:2).”

“in that day: Isa 12:1; Psa 106:47, Psa 106:48, Psa 113:1-3, Psa 117:1, Psa 117:2 call upon his name: or, proclaim his name, Exo 33:19, Exo 34:5-7; Ch1 16:8; Psa 105:1 declare: Isa 66:19; Psa 9:11, Psa 22:31, Psa 40:5, Psa 71:16-18, Psa 73:28, Psa 96:3, Psa 107:22, Psa 145:4-6; Jer 50:2, Jer 51:9, Jer 51:10; Joh 17:26 his name: Isa 2:11, Isa 2:17, Isa 25:1, Isa 33:5; Exo 15:2; Ch1 29:11; Neh 9:5; Psa 18:46, Psa 21:13; Psa 34:3, Psa 46:10, Psa 57:5, Psa 97:9, Psa 113:5; Phi 2:9-11 Isaiah 12:5”