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"Whoever swears (makes oath) by other than Allaah has committed shirk." (Riyaad us-Saaliheen, book 17, chapter 314 hadeeth #1711)

Inconspicuous shirk can be expiated by saying thrice the following sentences within a day and a night:

Allaahumma innee a'oodhu bika an ushrika bika wa-anna a'alam,
wa-astaghfiruka limaa laa a'alam

"O Allaah, I take refuge in you lest I should commit shirk with you knowingly, and I seek your forgiveness for what I do unknowingly."

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