Nehemiah 8:6

Blessed be Yahweh, the God of Israel, From everlasting to everlasting. Then all the people said, “Amen,” and praised Yahweh.

I also shook out the front of my garment and said, “Thus may God shake out every man from his house and from his possessions who does not establish this word; even thus may he be shaken out and emptied.” And all the assembly said, “Amen!” And they praised Yahweh. Then the people did according to this word.

Otherwise if you bless in the spirit only, how will the one who fills the place of the uninformed say the “Amen” at your giving of thanks, since he does not know what you are saying?