G1991–ἐπιστηρίζω–epistērizō

confirming the souls of the disciples, exhorting to remain in the faith, and that through many tribulations it behoveth us to enter into the reign of God,

ἐπιστηρίζοντες epistērizontes “strengthening”

Judas also and Silas, being themselves also prophets, through much discourse did exhort the brethren, and confirm,

ἐπεστήριξαν. epestērixan “strengthened [them].”

and he went through Syria and Cilicia, confirming the assemblies.

ἐπιστηρίζων epistērizōn “strengthening”

And having made some stay he went forth, going through in order the region of Galatia and Phrygia, strengthening all the disciples.

ἐπιστηρίζων epistērizōn “strengthening”