I rejoiced greatly that I found of thy children walking in truth, as we have received a commandment from the Father.
I found - probably in one of his tours of superintendence. See 'Introduction,' and 2 John 1:12; 3 John 1:10; 3 John 1:14.
Of thy children - some, in truth; i:e., in the Gospel truth.
As - even as. 'The Father's commandment' is the standard of "the truth."