'Traditions' in the Bible

(For the Pharisees and all the Jews do not eat unless they carefully wash their hands, thus observing the traditions of the elders;

Now I praise you because you remember me in everything and hold firmly to the traditions, just as I delivered them to you.

and I was advancing in Judaism beyond many of my contemporaries among my countrymen, being more extremely zealous for my ancestral traditions.

So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us.