Luke 3:5-6
Every ravine shall be filled up, and every mountain and hill levelled down, the crooked places shall be turned into straight roads, and the rugged ways into smooth;
Romans 14:13
Therefore let us no longer judge one another; but, instead of that, you should come to this judgement--that we must not put a stumbling-block in our brother's path, nor anything to trip him up.
1 Corinthians 1:23
while we proclaim a Christ who has been crucified--to the Jews a stumbling-block, to Gentiles foolishness,
1 Corinthians 8:9
But take care lest this liberty of yours should prove a hindrance to the progress of weak believers.
1 Corinthians 8:13
Therefore if what I eat causes my brother to fall, never again to the end of my days will I touch any kind of animal food, for fear I should cause my brother to fall.
1 Corinthians 10:32-33
Do not be causes of stumbling either to Jews or to Gentiles, nor to the Church of God.
2 Corinthians 6:3
We endeavour to give people no cause for stumbling in anything, lest the work we are doing should fall into discredit.
Hebrews 12:13
and make straight paths for your feet, so that what is lame may not be put entirely out of joint