Question

Why did they take a turn round the cairn?​

Answer 1

Another explanation is that they were to stop the dead from rising. There remains a Jewish tradition of placing small stones on a person's grave as a token of respect, though this is generally to relate the longevity of stone to the eternal nature of the soul and is not usually done in a cairn fashion.

Answer 2

Answer:

They all took a turn round the cairn according to the tradition....