Another matter, “you shall be holy” – that is what is written: “May He send you help from the Sanctuary” (Psalms 20:3). Rabbi Berekhya said in the name of Rabbi Simon: There was an incident involving Abba Yosei of Tzaitur, a villager, who was sitting and studying at the entrance to a spring. A certain spirit that dwelled there appeared to him. It said to him: ‘You know, how many years I have been dwelling here, and you and your wives come and go at night and in the morning, and you are not harmed.
Now, you should know, that an evil spirit seeks to dwell here, and it harms people.’ He said to it: ‘What shall we do?’ It said to him: ‘Go and warn the residents of the city: Anyone who has a hoe, anyone who has a spade, anyone who has a rake, let him come out here tomorrow at daybreak, and let him look at the water’s surface. When they see a whirlpool in the water, let them strike with their iron and say: Ours is victorious, and they shall not go from here until they see congealed blood on the water’s surface.’
He went and he warned the residents of the city, and said to them: ‘Anyone who has a hoe, anyone who has a spade, anyone who has a rake, let them come out there tomorrow at daybreak, and let them look at the water. When you see a whirlpool in the water, strike with the iron and say: Ours is victorious, ours is victorious, and do not go from here until you see congealed blood on the water’s surface.’
Can the matters not be inferred a fortiori? If the spirits, that were not created to [require] assistance, require assistance, we who were created to [require] assistance, all the more so. That is, “may He send you help from the Sanctuary.”