Romans 11:29 says “for God’s gifts and his call are irrevocable”. Can this verse be used in support of OSAS as it relates to Romans 8:30? If so, it seems one of the clearest statements I’ve seen to contradict anything we hear about losing our salvation.
The context of Romans 11:25-29 has Paul arguing that God cannot abandon Israel, because His gifts and His call are irrevocable. This means He can’t take back the land He gave them, and He can’t “un-chose” them as His people. In Jeremiah 31:35-37 the Lord said as long as natural laws like the sun shining every day and the moon and stars shining at night remain in force, Israel will always be a nation before Him.
In my opinion a better confirmation of Romans 8:30 (those He called He also justified) can be found in John 6:38-40.
“For I have come down from heaven not to do my will but to do the will of him who sent me. And this is the will of him who sent me, that I shall lose none of all that he has given me, but raise them up at the last day. For my Father’s will is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise him up at the last day.”