Folk means people, a nation, or a group. In some New Testament expressions, “folk” refers to people who are weak or sick and need help. The word can therefore describe either a community or persons considered according to their condition.
The Old Testament uses folk for a people or nation and even for a feeble group, as in the description of the conies. The New Testament uses “sick folk” for those who were not strong or were ill, including people brought for healing.