Wa `alaykum as-salamu wa rahmatullahi wa barakatuh.
This practice is nothing but pure superstition; the person who is practicing this is diluting Islam with pagan customs and practices.
Islam teaches us that no one knows the future or matters of unseen realities except Allah. Allah tells His Prophet to declare:
“Say [O Prophet]: “It is not within my power to bring benefit to, or avert harm from, myself, except as God may please. And if I knew that which is beyond the reach of human perception, abundant good fortune-would surely have fallen to my lot, and no evil would ever have touched me. I am nothing but a warner, and a herald of glad tidings unto people who will believe.” (Qur`an: 7: 188)
“Say [O Prophet]: “I do not say unto you, `God`s treasures are with me,`; nor [do I say], `I know the things that are beyond the reach of human perception`; nor do I say unto you, `Behold, I am an angel`: I but follow what is revealed to me.” Say: “Can the blind and the seeing be deemed equal? Will you not, then, take thought?” (Qur`an: 6: 50).
Therefore, the Prophet (peace be upon him) never allowed anyone to claim that he knew what would happen in the future. He was once attending a wedding where girls were singing. When they saw the Prophet (peace be upon him), they added these lines: “among us is a prophet who knows what happens tomorrow!” Upon hearing the words, he told them to cut them out and continue saying what they were saying before!
Therefore, those who claim to know the future or claim whose marriage will succeed and whose marriage will fail, are arrogating to themselves the power and knowledge of Allah: Therefore they are guilty of shirk.
Almighty Allah knows best.
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