I believe you're referring to a section of Scripture in the book of James.
"So speak and so do as those who will be judged by the law of liberty. For judgment is without mercy to the one who has shown no mercy. Mercy triumphs over judgment" (James 2:12-13 NKJ).
All of us have to answer for how we live our lives.
"For we must all appear before the judgment seat of Christ, that each one may receive the things done in the body, according to what he has done, whether good or bad" (2 Cor. 5:10 NKJ).
However, the Bible teaches that the judgment of how we live our lives, as well as our final judgment, is determined by the law of liberty. The law of liberty refers to the law of sowing and reaping.
"Do not be deceived, God is not mocked; for whatever a man sows, that he will also reap" (Gal. 6:7 NKJ).
If we show mercy to our fellow man, then God is going to show mercy to us. If we are quick to forgive and refrain from condemning others, then God will forgive and not condemn us. If we show mercy, and do not ruin another's life, we will reap mercy. If we are always trying to expose people's faults and the wrongs they have committed, then the Lord will be that way with us.
Notice what the Bible says about the love of God: "Hatred stirs up strife, but love covers all sins" (Prov. 10:12 NKJ). We need to show mercy to others, to be channels of help, and to forgive and not condemn them. Doing this will cause the Lord to be merciful with us.
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