Luke 3:5-6
Every valley shall be filled, and every mountain and hill shall be made low; and the crooked places shall be made straight, and the rough ways smooth;
Romans 14:13
Let us then no longer judge one another; but let this rather be your judgment, not to put a stumblingblock, or an occasion to fall, in a brothers way.
1 Corinthians 1:23
but we preach Christ crucified, to Jews a stumblingblock, and to gentiles foolishness,
1 Corinthians 8:9
But take heed, lest this liberty of yours become a stumblingblock to the weak.
1 Corinthians 8:13
Wherefore, if food cause my brother to fall, I will eat no flesh for ever, lest I cause my brother to fall. Am I not free?
1 Corinthians 10:32-33
Give no occasion of stumbling either to Jews or Greeks, or to the church of God;
2 Corinthians 6:3
giving no occasion for stumbling in anything, that the ministry may not be blamed;
Hebrews 12:13
and make straight paths for your feet, that the lame may not be turned out of the way, but may rather be healed.