Covenant

a formal agreement, contract, or promise in writing, especially one undertaking to make regular payments to a charity.

synonyms:

contract, compact, treaty, pact, accord, deal, bargain, settlement,concordat, protocol, entente, agreement, arrangement, understanding,pledge, promise, bond, indenture, guarantee, warrant; More

a clause in a contract drawn up by deed.

an agreement which brings about a relationship of commitment between God and his people. The Jewish faith is based on the biblical covenants made with Abraham, Moses, and David.

undertake to give (a sum of money) regularly to charity by means of a covenant.