1 John 5:2

2. For τηρῶμεν ([766][767][768]) read ποιῶμεν ([769] and Versions). [770] omits from αὐτοῦ in 1 John 5:2 to αὐτοῦ in 1 John 5:3 : homoeoteleuton.

[766] 4th century. Discovered by Tischendorf in 1859 at the monastery of S. Catherine on Mount Sinai, and now at Petersburg. All three Epistles.
[767] 9th century. All three Epistles.
[768] 9th century. All three Epistles.
[769] 4th century. Brought to Rome about 1460. It is entered in the earliest catalogue of the Vatican Library, 1475. All three Epistles.
[770] 5th century. Brought by Cyril Lucar, Patriarch of Constantinople, from Alexandria, and afterwards presented by him to Charles I. in 1628. In the British Museum. All three Epistles.

2. The converse of the truth insisted upon in 1 John 4:20-21 is now stated. Their love and obedience to God were shewn to involve love of His children: here love of God’s children is said to follow from our love and obedience to God. The two (or three) ideas mutually imply one another. Love to God implies obedience, and either of these implies love of His children, which again implies the other two. In short, love to God and love to the brethren confirm and prove each other. If either is found alone, it is not genuine. Fellowship with God and fellowship one with another (1 John 1:3; 1 John 1:7) necessarily exist together. A man may be conscious of kindliness towards others and yet doubt whether he is fulfilling the law of brotherly love. For such the Apostle gives this test, ‘Do you love God? Do you strive to obey Him? If so your love of others is of the right kind’. For the characteristic phrase ‘keep His commandments’ see on 1 John 2:3 : but here the true reading seems to be do His commandments, a phrase which occurs nowhere else. This reading is supported by [839], all ancient Versions, and several Fathers. Note the ‘when’, or more literally, ‘whenever’ (ὅταν): whenever we love and obey we have fresh evidence that our philanthropy is Christian. Nowhere else in these Epistles does ὅταν occur.

[839] 4th century. Brought to Rome about 1460. It is entered in the earliest catalogue of the Vatican Library, 1475. All three Epistles.