I remember how business dealings were done between my father and others when I was young. Agreements were made and sealed with a handshake. Trust was offered and received without the necessity of a written contract. Though this practice is frowned upon today and in some cases impractical, the Bible makes a case for it.
Ex. 22:10-11 “If a man deliver unto his neighbour an ass, or an ox, or a sheep, or any beast, to keep; and it die, or be hurt, or driven away, no man seeing it: Then shall an oath of the LORD be between them both, that he hath not put his hand unto his neighbour's goods; and the owner of it shall accept thereof, and he shall not make it good.”
LESSON - The great principal taught in this passage of scripture is the importance of integrity. As Christians, we above all others should be people of our word. Promises made should be promises kept. This is even addressed in the New Testament. James 5:12 “But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.” The Lord always expects you to keep your word!