They themselves, both the brethren and especially the strangers, bore witness before the Church about your love. This may have been done publicly, in a common assembly on some occasion, or privately in praise of one or another of the believers. More probably it was public, in the assembly.
They testified about your love generally toward all the brethren and especially toward strangers. That is, they publicly testified to Gaius's love for strangers.
"Before the Church" does not mean the church where Gaius lived, as is clear from the structure of the speech. It means the church where the Apostle John was staying when the Epistle was written, probably the Church of Ephesus.
Read more (107 words)
You act well toward them, as a faithful man, by receiving them. You will also act well if you send them on their way, and as you do send them, for God's sake, as is fitting, according to God, in a way worthy of God (1 Thess 2:12; Col 1:10). This means that you should continue this good work of hospitality for God's sake and not abandon it.
"You will send them on their way" means that you will care for their safety, accompany them in peace, and not only accompany and dispatch them, but also see that they lack nothing (cf. 1 Cor 16:10-11; Tit 3:13).