Tertullian Against Marcion Book IV

Surely to Sion He brings good tidings, and to Jerusalem peace and all blessings; He goes up into a mountain, and there spends a night in prayer,[423]

Cyprian Epistle VII

For the apostles also ceased not to pray day and night; and the Lord also Himself, the teacher of our discipline, and the way of our example, frequently and watch-fully prayed, as we read in the Gospel: "He went out into a mountain to pray, and continued all night in prayer to God."[16]

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Old Testament