Psalms 81:9 - Ellicott's Commentary On The Whole Bible

Open... — A condensed statement of God’s gracious promise (Deuteronomy 7:12-13; Deuteronomy 8:7; Deuteronomy 8:9; Deuteronomy 11:13; Deuteronomy 11:16, &c). It is said to have been a custom in Persia, that when the king wishes to do a visitor especial honour he desires him to open his mouth wide, and the king then-crams it full of sweetmeats, and sometimes even with jewels. And to this day it is a mark of politeness in Orientals to tear off the daintiest bits of meat for a guest, and either lay them before him, or put them in his mouth. (See Thomson, Land and Book, p. 127.)