Abu Dawud

Benefits and Issues:
If a person expresses good wishes for another, the positive effect of that good wish is imparted to the other person.
Similarly, negative wishes such as envy, etc., also have a strong negative impact on others.
Modern psychology has clarified that a person can very quickly influence another through his intention, desire, and attention.
The phenomenon of the evil eye (nazar) is also of this nature: upon seeing someone’s virtue, a feeling of envy arises in some souls; if this is intense and the envious person possesses a strong and forceful will, then due to this envy, negative effects are produced on the other person.
Generally, since the virtues of another are seen with the eyes and the feeling of envy arises immediately upon seeing, this is why in most languages it is referred to as “the evil eye” or by words of similar meaning.
The editor of the English translation of Hafiz Ibn al-Qayyim rahimahullah’s book “al-Tibb al-Nabawi,” the new Muslim scholar Abdulrahman Abdullah (formerly Raymond J. Mandierola, Fordham University, USA), has written an interesting note in this regard.
Its summary is that the force of evil secretly makes various things or people its instruments and, through them, harms human beings.
In Western society, this is manifested in the form of schoolchildren collectively killing their classmates, an individual committing dozens of murders one after another without enmity, criminal violence against children, and in the making of such films in which, to give a sense of reality, people are actually killed and the films (Snuff Movies) are produced.
If it is not accepted that the force of evil makes humans its instruments to carry out these acts, then it must be accepted that all of this is inherent in human nature itself.
A Muslim is taught to seek Allah’s protection from these forces of evil.
(Medicine of Prophet by Ibn Qayyim Al-Jauziyah, footnote 157) For this purpose, the Messenger of Allah sallallahu alayhi wa sallam has taught and supplicated many prayers.
The Messenger of Allah sallallahu alayhi wa sallam is also commanded that when someone is affected by the evil eye, upon seeing something good or a person, he should immediately supplicate for blessing (barakah) for them.
If the effects of the evil eye on a person are severe, the treatment prescribed is that the person whose gaze caused the harm should perform ablution (wudu), and the part of the lower garment (such as the waist-wrapper) that touches the back should be washed, and this used water should be poured over the affected person.
Although this hadith in Abu Dawud is weak in its chain, there are authentic supporting narrations, such as the narration from Muwatta, which has been referenced above.
This is a spiritual remedy.
It is not necessary to know how it works, but it can be understood that through ablution (wudu), a person is freed from the effects of negative actions committed intentionally or unintentionally.
One way to seek refuge from the evil consequences of these negative actions is that when the person who caused the evil eye seeks refuge from these matters through ablution (wudu), and the water of ablution removes them, then if the person affected by his negative feelings pours this water over himself, the effect will be removed all the more so.