'Faith in Jesus' in the Bible

and he asked for letters [of authority] from him to the synagogues at Damascus, so that if he found any men or women there belonging to the Way [believers, followers of Jesus the Messiah], men and women alike, he could arrest them and bring them bound [with chains] to Jerusalem.

It was to demonstrate His righteousness at the present time, so that He would be just and the One who justifies those who have faith in Jesus [and rely confidently on Him as Savior].

since indeed it is one [and the same] God who will justify the circumcised by faith [which began with Abraham] and the uncircumcised through [their newly acquired] faith.

To the weak I became [as the] weak, to win the weak. I have become all things to all men, so that I may by all means [in any and every way] save some [by leading them to faith in Jesus Christ].

But the Scripture has imprisoned everyone [everything—the entire world] under sin, so that [the inheritance, the blessing of salvation] which was promised through faith in Jesus Christ might be given to those who believe [in Him and acknowledge Him as God’s precious Son].

Here is [encouragement for] the steadfast endurance of the saints (God’s people), those who habitually keep God’s commandments and their faith in Jesus.