"It seemed good to the Holy Spirit and to us not to burden you with anything beyond the following requirements: You are to abstain from food sacrificed to idols, from blood, from the meat of strangled animals and from sexual immorality. You will do well to avoid these things." (Acts 15:28, 29, NIV) Note: there is no mention of salvation in these verses. We know salvation is only through Jesus Christ. “Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.” (Acts 4:12) However, can a person lose his salvation if he repeatedly and consistently disobeys God and hardens his heart against God’s commandments? Yes.
The unpardonable sin is a sin which God declines to forgive. The Apostle John warned that there is a “sin that leads to death.” (1 John 5:16) Jesus warned in Matthew 12:31,32, about a sin against the Holy Spirit, which will not be forgiven. This is also called a sin again light or knowledge. Paul describes this sin very well in Hebrews 10:26, “If we deliberately keep on sinning after we have receive the knowledge of the truth, no sacrifice for sins is left.”
Therefore, if we know something is against God’s commands and decide to repeatedly disobey those commands, we harden our hearts against the light of the Holy Spirit. We sin against the knowledge of the truth. Then we can lose our salvation.
But please recognize, our sins of weakness and ignorance are covered by Jesus’s blood. 1 John 1:9, “If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.” We can never completely stop sinning in this present life. Daily, we need to confess our sins and ask for forgiveness through Jesus’s blood. Then God will forgive us and cleanse us (by teaching or disciplining) from our sinful ways.
In conclusion, it would be wise to obey Acts 15:28,29 and any commands which God gives us. Obedience brings blessings!