Psalms 34:3

3O 34:3 The ancient rabbis applied this verse specifically to the saying of grace after a meal and instituted the practice of zimmum (“invitation”) as a religious duty for three or more men who had eaten together. They were to invite one another to say the blessing. One then said the blessing and the others were required to say “Amen” in voices no louder than that of the speaker of the blessing, based on the word together. It was also taught that all the participants in the blessing receive a reward from God.magnify the Lord with me,

And let us lift up His name together.