Verses with the word lawful in the Old Testament (9 verses):

Ezra 7:24
Also we certify you, that touching any of the priests and Levites, singers, porters, Nethinims, or ministers of this house of God, it shall not be lawful to impose toll, tribute, or custom, upon them.

Isaiah 49:24
Shall the prey be taken from the mighty, or the lawful captive delivered?

Ezekiel 18:5
But if a man be just, and do that which is lawful and right,

Ezekiel 18:19
Yet say ye, Why? doth not the son bear the iniquity of the father? When the son hath done that which is lawful and right, and hath kept all my statutes, and hath done them, he shall surely live.

Ezekiel 18:21
But if the wicked will turn from all his sins that he hath committed, and keep all my statutes, and do that which is lawful and right, he shall surely live, he shall not die.

Ezekiel 18:27
Again, when the wicked man turneth away from his wickedness that he hath committed, and doeth that which is lawful and right, he shall save his soul alive.

Ezekiel 33:14
Again, when I say unto the wicked, Thou shalt surely die; if he turn from his sin, and do that which is lawful and right;

Ezekiel 33:16
None of his sins that he hath committed shall be mentioned unto him: he hath done that which is lawful and right; he shall surely live.

Ezekiel 33:19
But if the wicked turn from his wickedness, and do that which is lawful and right, he shall live thereby.