Here are some verse that indicate that faith is a gift from God.
For in it the righteousness of God is revealed from faith to faith; as it is written, –The just shall live by faith.— (Romans 1:17 NKJV)
looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God. (Hebrews 12:2 NKJV)
He indeed was foreordained before the foundation of the world, but was manifest in these last times for you who through Him believe in God, who raised Him from the dead and gave Him glory, so that your faith and hope are in God. (1 Peter 1:20-21 NKJV)
One of the most often quoted verses for support that faith is a gift is Ephesians 2:8-9.
For by grace you have been saved through faith, and that not of yourselves; [it is] the gift of God, not of works, lest anyone should boast. (Ephesians 2:8-9 NKJV)
However, there are some grammatical issues that for me make it a less than stellar support for the argument. The basic issue is that the gender for the word “it” (pronoun for the word “gift”) does not agree with the gender of the word “faith.” When you get down to it, the word “it” is referring to the overall concept of salvation, as opposed to the specific word “faith.”