There is no one passage of Scripture that Arminians/semi-Pelagians use to support their error. But to get you started, here are a few items:

In Robert Harbach's article, Calvinism...the Truth (Arminianism the Lie), under the heading "PERSEVERANCE OF SAINTS" he writes:

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7. ARMINIANISM wrests Scripture to teach that it is possible for the true believer to fall from the grace of salvation (Gal.5:4); and that each believer is provided with sufficient ability to persevere and preserve himself, if only he will: (“And ye will not come to Me, that ye might have life,” Jh. 5:40). If all depends on the choice of man’s will, whether he will persevere or not. (This denies everything thus far so irrefutably declared!) The error continues: not only is it possible that believers fatally and finally fall, sin unto death, and be eternally lost, but indeed, may often fall, be often recovered, yet in the end be lost to God. “Take heed, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God” (Heb. 3:11). There is, then, no such thing in this life as certainty of eternal security, nor assurance of perseverance: “Have not I chosen you twelve and one of you is a devil ? . . . And began every one of them to say unto Him, Is it I, Lord?” (Jh. 6:70; Matt. 26:22).
You can read much more here: Perseverance of the Saints, by Loraine Boettner. Another important article which exposes a popular error in regard to the doctrine of the Perseverance of the Saints is this review article by Iain Murray, Will the Unholy be Saved?.

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simul iustus et peccator

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