If somebody or a church is teaching you this way for the purpose of the discipline of its members or for other reason, then you must be very careful since their teaching is contrary to what God says in His Word – the Bible. God has promised that once you have accepted Jesus Christ as the Savior of your soul, then your Salvation will never perish, neither can any man or anything pluck your salvation of the hand of God. (John 10:28)

It is true that if you commit sin(s) after being born again, though you will not loose your salvation, you will loose blessings you can get from God as His child through close fellowship with Him because God will not see you when you have sin in you. But God is so generous and understanding that He has also prepared a way to have our sins forgiven. God said if we, as born again children, confess our sins to Him, He will forgive our sins (1 John 1:9).

If you have really accepted Jesus Christ as your personal Savior in your heart and have identified yourself with Christ to other Christians, then, do not listen when somebody says you may loose your salvation.

Salvation is not given to us because we worked hard to earn it but it is a free gift from God to whoever accept Jesus Christ as his personal Savior. However, after confessing to God and other Christians that you have accepted Jesus as Savior and the Master of your life, if you are not showing any changes in your Christian life, it maybe a proof that you are NOT saved. The Bible says if any man is saved and is in Christ, he is new creature and the old things have passed away (2 Cor. 5:17). Even after your acceptance of Jesus, if you do not show any changes in your life, as in the case of many people, you might have only agreed that he is the Savior and Master but you have not fully accepted Him and Trusted your life on Him yet. Fallen Angels (a.k.a. demons, devils, etc.) also believe in God but they are not saved. (James 2:19) Once Salvation is given to you, it is permanent but make sure that you Trust Him when you first met Jesus Christ.