Exodus 32

 We learn again that salvation is an individual thing as Moses approaches the Lord concerning repentance - 

"And it came to pass on the morrow, that Moses said unto the people, Ye have sinned a great sin: and now I will go up unto the Lord; peradventure I shall make an atonement for your sin.

31 And Moses returned unto the Lord, and said, Oh, this people have sinned a great sin, and have made them gods of gold.

32 Yet now, if thou wilt forgive their sin—; and if not, blot me, I pray thee, out of thy book which thou hast written."  (Exodus 32:30–32)

But the Lord answers - 

"Whosoever hath sinned against me, him will I blot out of my book."  (Exodus 32:33)

There is only One who can atone for our sins on the condition of repentance.