The "field" is added to the list of objects specifically forbidden in the parallel passage Exodus 20:17. The addition seems very natural in one who was speaking with the partition of Canaan among his hearers directly in view.

His field - This clause is not in the tenth commandment as it stands in Exodus 20:17.

Neither shalt thou desire thy neighbour's wife,.... Here a neighbour's wife is put before his house, different from Exodus 20:17 and "his field" is added, which with what follows take in everything that is a man's property; and which is not to be desired or coveted in an unlawful manner by another, and much less should any means be made use of to deprive him of it; but "lust" is the thing intended and prohibited, be it after what it may, which is another man's: see Matthew 5:28, of a man's field, see Isaiah 5:8.

Neither shalt {h} thou desire thy neighbour's wife, neither shalt thou covet thy neighbour's house, his field, or his male servant, or his female servant, his ox, or his donkey, or any thing that is thy neighbour's.

(h) He not only speaks of that resolute will, but that there should be no motion or affection.

5:21 Neither shalt thou covet any thing that is thy neighbour's - The plain meaning of this is, thou shalt not desire any thing that is not thy own, any thing which thou hast not. Indeed why shouldst thou? God hath given thee whatever tends to thy one end, holiness. Thou canst not deny it, without making him a liar: and: when any thing else will tend thereto, he will give thee that also. There is therefore no room to desire any thing which thou hast not. Thou hast already every thing that is really good for thee, wouldst thou have more money, more pleasure, more praise still? Why this is not good for thee. God has told thee so, by withholding it from thee. O give thyself up to his wise and gracious disposal!

21. Neither shalt thou desire thy neighbour's wife, . house, his field-An alteration is here made in the words (see Ex 20:17), but it is so slight ("wife" being put in the first clause and "house" in the second) that it would not have been worth while noticing it, except that the interchange proves, contrary to the opinion of some eminent critics, that these two objects are included in one and the same commandment.

5:6-22 There is some variation here from Ex 20 as between the Lord's prayer in Mt 6 and Lu 11. It is more necessary that we tie ourselves to the things, than to the words unalterably. The original reason for hallowing the sabbath, taken from God's resting from the work of creation on the seventh day, is not here mentioned. Though this ever remains in force, it is not the only reason. Here it is taken from Israel's deliverance out of Egypt; for that was typical of our redemption by Jesus Christ, in remembrance of which the Christian sabbath was to be observed. In the resurrection of Christ we were brought into the glorious liberty of the children of God, with a mighty hand, and an outstretched arm. How sweet is it to a soul truly distressed under the terrors of a broken law, to hear the mild and soul-reviving language of the gospel!