'Believing' in the Bible

But he said this about the Spirit, which those believing in him were to receive. For the Holy Spirit was not yet given, because Jesus wasn't yet glorified.

Then he said to Thomas, "Reach here your finger, and see my hands. Reach here your hand, and put it into my side. Don't be unbelieving, but believing."

but these are written, that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in his name.