Psalm 55:16-17: "16 But I call to God, and the LORD will save me. 17 Evening and morning and at noon I utter my complaint and moan, and he hears my voice."
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The "call[ing] to God" in Psalm 55:16 appears in each of the hymn's verses ("Lord... Be there... and give us..."), and the various times in verse 17 ("Evening and morning and at noon") appear at the end of each verse ("at the break of the day," "at the noon of the day," "at the eve of the day," and "at the end of the day").