'Sins' in the Bible

if we may confess our sins, stedfast He is and righteous that He may forgive us the sins, and may cleanse us from every unrighteousness;

and he -- he is a propitiation for our sins, and not for ours only, but also for the whole world,

I write to you, little children, because the sins have been forgiven you through his name;

and ye have known that he was manifested that our sins he may take away, and sin is not in him;

in this is the love, not that we loved God, but that He did love us, and did send His Son a propitiation for our sins.