Bible Verses About Pillars: Sometimes of a heap of stones

The people of Isra'el did just as Y'hoshua had ordered. They took twelve stones out of the Yarden riverbed, as ADONAI had said to Y'hoshua, corresponding to the number of the tribes of the people of Isra'el, carried them over with them to the place where they were camping, and set them down there.

Y'hoshua also set up twelve stones in the Yarden River itself, in the place where the feet of the cohanim carrying the ark for the covenant had stood. They are there to this day.

Those twelve stones which they took out of the Yarden, Y'hoshua piled up at Gilgal.