And ye shall know that I am the LORD, when I have opened your graves, O my people, and brought you up out of your graves,

And you shall know that I am the Lord, when I shall have opened your sepulchres, and shall have brought you out of your graves, O my people:

And ye have known that I am Jehovah, In My opening your graves, And in My bringing you up out of your graves, O My people.

And you will be certain that I am the Lord by my opening the resting-places of your dead and making you come up out of your resting-places, O my people.

And you shall know that I am the Lord, when I will have opened your sepulchers, and when I will have led you away from your tombs, O my people.

When I have opened your graves - When I shall have done for you what was beyond your hope, and deemed impossible, then shall ye know that I am Jehovah.

And ye shall know that I [am] the LORD, (c) when I have opened your graves, O my people, and brought you out of your graves,
(c) That is, when I have brought you out of those places and towns where you are captives.

And ye shall know that I am the Lord,.... See Gill on Ezekiel 37:6,
when I have opened your graves, O my people, and brought you up out of your graves; which is doing that for them which none but the omnipotent God could do; and they seeing his hand and power, his grace and mercy in it, will know, own, and acknowledge him.