Deuteronomy 22:2

If their owner is not near, or if you are not certain who he is, then take the beast to your house and keep it till its owner comes in search of it, and then you are to give it back to him.

Matthew 7:12

All those things, then, which you would have men do to you, even so do you to them: because this is the law and the prophets.

1 Thessalonians 4:6

And that no man may make attempts to get the better of his brother in business: for the Lord is the judge in all these things, as we said to you before and gave witness.

Treasury of Scripture Knowledge

Summary

And if thy brother be not nigh unto thee, or if thou know him not, then thou shalt bring it unto thine own house, and it shall be with thee until thy brother seek after it, and thou shalt restore it to him again.

Thou shalt restore

General references

Bible References

Thou shalt restore

Matthew 7:12
All those things, then, which you would have men do to you, even so do you to them: because this is the law and the prophets.
1 Thessalonians 4:6
And that no man may make attempts to get the better of his brother in business: for the Lord is the judge in all these things, as we said to you before and gave witness.

General references

Exodus 23:4
If you come across the ox or the ass of one who is no friend to you wandering from its way, you are to take it back to him

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain