'Strengthening' in the Bible

As the war between the house of Saul and the house of David was [continuing], Abner was strengthening himself in the house of Saul.

And an angel from heaven appeared to him, strengthening him.

strengthening the souls of the disciples, encouraging [them] to continue in the faith and [saying], "Through many persecutions it is necessary [for] us to enter into the kingdom of God."

And he traveled through Syria and Cilicia, strengthening the churches.

And [after] spending some time [there], he departed, traveling through one [place] after another [in] the Galatian region and Phrygia, strengthening all the disciples.