Deuteronomy 27:16

So he said, “Cursed be Canaan; A servant of servants He shall be to his brothers.”

“Honor your father and your mother, that your days may be prolonged in the land which Yahweh your God gives you.

‘If there is anyone who curses his father or his mother, he shall surely be put to death; he has cursed his father or his mother. His bloodguiltiness is upon him.

‘Honor your father and your mother, as Yahweh your God has commanded you, that your days may be prolonged and that it may go well with you on the land which Yahweh your God gives you.

“They have treated father and mother with contempt within you. The sojourner they have oppressed in your midst; the fatherless and the widow they have mistreated in you.

“Indeed all Israel has trespassed against Your law, even turning aside, not listening to Your voice; so the curse has been poured out on us, along with the oath which is written in the law of Moses the servant of God, for we have sinned against Him.

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?