Luke 17:12

There met him ten men— As lepers were banished from the towns, they were likewise obligated to keep at a distance from the roads which led to them. Curiosity, however, to see the travellers who passed, or an inclination to beg, or perhaps a pre-concerted plan to find out Jesus, having brought these ten as nigh to the public road as they could, they espied our Lord, and cried to him, beseeching him to take pity on them, and cure them. It seems they knew him personally, having seen him before, or guessed that it might be he from the crowds which followed him. If it be asked how so many lepers came together, the answer is, that being secluded from the society of other men on account of their disease, they sought the comforts of society in the company of each other.