Deuteronomy 27:19

“You shall not mistreat a sojourner or oppress him, for you were sojourners in the land of Egypt.

“And you shall not oppress a sojourner, since you yourselves know the soul of a sojourner, for you also were sojourners in the land of Egypt.

“You shall not pervert the justice due a sojourner or an orphan, nor take a widow’s garment in pledge.

“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.

“Then I will draw near to you for judgment; and I will be a swift witness against the sorcerers and against the adulterers and against those who swear falsely and against those who oppress the wage earner in his wages, the widow and the orphan, and those who turn aside the sojourner and do not fear Me,” says Yahweh of hosts.

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?