1 Corinthians 15:31
I protest by your rejoicing which I have in Christ Jesus our Lord, I die daily.
Note 3 at 1Co 15:31: This verse is often quoted as Paul dying to sin daily, but that is not what this is saying. The context makes it very clear that Paul was speaking of physical death. He was saying that he faced death on a daily basis. It would be stupid to do so if there were no resurrection. If there were no resurrection and no eternal destiny at stake, we should just "party" and forgo the hardships (1Co 15:32).
The Bible does not teach a daily death to sin. It clearly states that we died unto sin once, just as Jesus did (Ro 6:1-11), and that we should continually reckon that to be so (see note 3 at Ro 6:2 and note 8 at Ro 6:6).