31 ¶ When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory: 32 And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats: 33 And he shall set the sheep on his right hand, but the goats on the left. 34 Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world: 35 For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in: 36 Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me. 37 Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink? 38 When saw we thee a stranger, and took thee in? or naked, and clothed thee? 39 Or when saw we thee sick, or in prison, and came unto thee? 40 And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me. 41 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels: 42 For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink: 43 I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not. 44 Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee? 45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me. 46 And these shall go away into everlasting punishment: but the righteous into life eternal. (Matthew 25:31-46) Note that he the people are condemned for not for what they did do, but for what they did not go (sins of omission).

In addition to Matthew 25:31-46, the parable of the Good Samaritan shows sins of omission in Luke 10:30-33: Jesus replied, "A man fell victim to robbers as he went down from Jerusalem to Jericho. They stripped and beat him and went off leaving him half-dead. A priest happened to be going down that road, but when he saw him, he passed by on the opposite side. Likewise a Levite came to the place, and when he saw him, he passed by on the opposite side. But a Samaritan traveler who came upon him was moved with compassion at the sight. The priest and the Levite committed sins of omission. With love in Christ.

The passage that is typically used is James 4:17 "Anyone, then, who knows the good he ought to do and doesn't do it, sins." Sin of commission is doing the bad you know you aren't supposed to do, but here, point blank, James says that even not doing the good thing is a sin.