Romans 2:15

15They show that the work of the law is awritten on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them

Romans 8:16

16 bThe Spirit himself bears witness with our spirit that we are children of God,

2 Corinthians 1:12

Paul’s Change of Plans

12For our boast is this, cthe testimony of our conscience, that we behaved in the world with simplicity
Some manuscripts holiness
and egodly sincerity, fnot by earthly wisdom but by the grace of God, and supremely so toward you.

1 Timothy 1:5

5The aim of our charge is love gthat issues from a pure heart and ha good conscience and ia sincere faith.

1 John 3:19-21

19By this we shall know that we are of the truth and reassure our heart before him; 20for whenever our heart condemns us, God is greater than our heart, and he knows everything. 21Beloved, jif our heart does not condemn us, kwe have confidence before God;
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