Two to three is the best number to keep very close to you. That being a level of trust you know they can and will uphold.
Jesus keep three disciples extra close to him and took them with him in his last hours.
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Jesus was accompanied by three Apostles: Peter, John and James, whom he asked to stay awake and pray. He moved "a stone's throw away" from them, where He felt overwhelming sadness and anguish, and said "My Father, if it is possible, let this cup pass me by. Nevertheless, let it be as you, not I, would have it."