epistērizō

(Translation from NRSV)

Acts

14: 22	There they strengthened (epistērizō) the souls of the disciples and encouraged them to continue in the faith, saying, "It is through many persecutions that we must enter the kingdom of God."
15: 32	Judas and Silas, who were themselves prophets, said much to encourage and strengthen (epistērizō) the believers.
15: 41	He went through Syria and Cilicia, strengthening (epistērizō) the churches.
18: 23	After spending some time there he departed and went from place to place through the region of Galatia and Phrygia, strengthening (epistērizō) all the disciples.