John 14:27 - Matthew Poole's English Annotations on the Holy Bible

Peace be with you, or to you, was the Jewish common salutation, 1 Samuel 25:6; under that general name they comprehended all manner of good: with this good wish they both saluted their friends when they met them, and took their farewell of them when they left them. Christ, being now about to take his leave for a time of his disciples, wishes them peace; nay, he doth not only wish it to them, but he leaves it to them; he giveth it them as a legacy; and that in another kind of peace, and in another manner, than was common. He therefore calls it his peace revealed in the gospel, Ephesians 6:15; purchased with his blood, Romans 5:1; brought to the soul by his Spirit, by which we are sealed to the day of redemption. Christ's peace is either union or reconciliation with God, or the copy of it, which is a quiet of conscience, and assurance of his love; or a union with men by brotherly love, so often commended and pressed by Christ. Nor doth Christ give this peace as the men of the world give peace; who often wish peace earnestly, never considering what it is they say; often falsely, formally wishing peace, when they are about to strike those to whom they wish it under the fifth rib; and when they are most serious, wish it, but cannot give it. Christ leaves it to his disciples for a legacy, giveth it to them as a gift; if they want it, it is their own fault: therefore, as in the first verse, so here again he saith, Let not your heart be troubled; and adds, neither let it be afraid. Fear is one of those passions which most usually and potently doth disturb the hearts and minds of men; but there was no reason it should have this ill influence on Christ's disciples, because he had left them peace for his legacy, and the gifts of God are without repentance; and, if God be for us, (saith the apostle, Romans 8:31), who, or what, can be against us?