World Wide Study Bible
a Bible passage
“Master, now you are dismissing your servant in peace,
according to your word;
29. Lord—"Master," a word rarely used in the New Testament, and selected here with peculiar propriety, when the aged saint, feeling that his last object in wishing to live had now been attained, only awaited his Master's word of command to "depart."
now lettest, &c.—more clearly, "now Thou art releasing Thy servant"; a patient yet reverential mode of expressing a desire to depart.