Albert Barnes Commentary Joel 2:26

"And ye shall eat in plenty and be satisfied, and shall praise the name of Jehovah your God, that hath dealt wondrously with you; and my people shall never be put to shame." — Joel 2:26 (ASV)

And you shall eat in plenty and be satisfied - It is a punishment from God when people eat and are not satisfied ; it is man’s sin that they are satisfied and do not praise God, but all the more forget Him (Hosea 13:6). And so God’s blessings become a curse to him. God promises to restore His gifts and to give grace as well, so that they will acknowledge and thank Him.

Who has dealt wondrously with you - “First, He wonderfully afflicted and chastened them, and then gave them wonderful abundance of all things, and very great and miraculous consolation after vehement tribulation, so that they might truly say, This is the change of the Right Hand of the Most High.”

And My people shall never be ashamed - “Provided that they persevere in His service. Although they incur temporal confusion, yet this shall not last forever, but the people of the predestinate, penitent, and patient in adversity, will be saved forever.”