What is the ruling on making du’aa’ in the colloquial language?

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In the case of general supplication (du’aa’), it is not stipulated that it should be narrated in the Sunnah
Is it essential that the du’aa’s recited in prayer be proven in the Sunnah?

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Related Answers:
What is the ruling on a person insisting by an oath that his Lord should do something?
It is not permissible to pray against oneself
There is no specific du’aa’ to be recited when starting to fast
In the case of general supplication (du’aa’), it is not stipulated that it should be narrated in the Sunnah
Is it essential that the du’aa’s recited in prayer be proven in the Sunnah?

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