And it was narrated that Sahl ibn Hanif (RA) said: The Messenger of Allah said:
If one of you sees something that he likes in himself or his wealth, let him pray for blessing for it, for the evil eye is real Narrated by Ibn Al-Sunni, and by Imam Ahmad and Al Haakim
This Hadith indicates that the evil eye cannot do any harm if the person who is doing it prays for blessing, rather it can only do harm if he does not pray for its blessing. This was pointed out by Al-Qurtubi and others. Tafseer Al-Qurtubi, 9/227
Then he said: Every Muslim who likes something must pray for blessing, for if he prays for blessing, that will ward off any potential harm, beyond a doubt.
Ibn Hajar said: The one who likes something must hasten to pray for blessing for the thing that he likes, and that will be a Ruqya on his part. Fath Al-Baari, 10/205
The way in which blessing is sought is to say
Baarik Allahu fi
(May Allah bless it)
Or
Allah-humma baarik alayhi
(O Allaah, bless it).
And one may say
Ma Sha Allah, La hawla wala qoowata illa billa
(that which Allah wills (will come to pass)
as in the Verse:
It was better for you to say, when you entered your garden: 'That which Allah wills (will come to pass)! There is no power but with Allah! (Al-Qur’an, 18:39)
The Sunnah is to make Du'aa for the blessing of Allah (SWT) upon that person or object, so they can be protected from the Evil Eye.
Narrated Sahl ibn Hanif (ra) that the Prophet (PBUH) came out and travelled with him towards Makkah, until they were in the mountain pass of Al-Kharaar in al-Jahfah. There Sahl ibn Hanif did ghusl, and he was a handsome white-skinned man with beautiful skin. Aamir ibn Rabee’ah (one of Banu Adiyy ibn Ka’b) looked at him whilst he was doing ghusl and said:
I have never seen such beautiful skin as this, not even the skin of a virgin
and Sahl fell to the ground. They went to Messenger of Allah (PBUH) and said,
O Messenger of Allah, can you do anything for Sahl, because by Allah he cannot raise his head.
He (PBUH) said:
Do you accuse anyone with regard to him?
They said, “ ‘Aamir ibn Rabee’ah looked at him.” So the Messenger of Allah (PBUH) called ‘Aamir and rebuked him strongly. He (PBUH) said:
Why would one of you kill his brother? If you see something that you like, then pray for blessing for him.
Then he said to him,
Wash yourself for him.
So he washed his face, hands, forearms, knees and the sides of his feet, and inside his izaar (lower garment) in the vessel. Then that water was poured over him, and a man poured it over his head and back from behind. He did that to him, then Sahl got up and joined the people and there was nothing wrong with him.
(Imam Ahmad 15550, Maalik 1811, al-Nasaa’i and Ibn Hibbaan - Classed as Sahih by al-Albaani in Al-Mishkaat 4562)
The Prophet (PBUH) Him said:
Whoever among you sees something in himself or in his possessions or in his brother that he likes, let him pray for blessing for it, because the evil eye is real. (Narrated by Ibn al-Sunni in Aml al-Yawm wal-Laylah p168; and by al-Haakim 4/216. Classed as saheeh by al-Albaani in al-Kalim al-Tayyib 243)
Hence Say:
Directly to a Person: Baarak Allahu feek/feekum (may Allah bless you)
If the direct person is Female: Baarak Allahu feeki (may Allah bless you)
For a Male: Allah humma Baarik lahu (may Allah bless him)
For a Female: Allah humma Baarik laha (may Allah bless her)
To an object such as a Car etc: Baarak Allahu laka fiha (may Allah bless it)
Ibn Al-Qayyim said : If the one who could cause the evil eye fears his eye and the possibility of him harming the person he saw something on him and liked, he should avoid its harm by saying: Allah humma Baarik Alay as the Prophet (PBUH) instructed to Amir Bin Rabi’ah when he gave a bad eye to Sahl bin Hanif.