G4732–στερεόω–stereoō

Then taking his hand Peter lifted him up, and immediately his feet and ankles were strengthened.

ἐστερεώθησαν estereōthēsan “were strengthened”

It is His name-- faith in that name being the condition--which has strengthened this man whom you behold and know; and the faith which He has given has made this man sound and strong again, as you can all see.

ἐστερέωσεν estereōsen “has strengthened”

So the Churches went on gaining a stronger faith and growing in numbers from day to day.

ἐστερεοῦντο estereounto “were strengthened”