Why do some of the scholars disallow tawassul by virtue of the status of the Prophet (blessings and peace of Allah be upon him)?

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Is there a specific prayer for increasing provision?
Tawassul: Islamic vs. bid'ah

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 Ruling on asking of Allaah by virtue of the status of the righteous before Him
The hadeeth about Adam’s tawassul by the Prophet, and the meaning of the verse “And seek the means of approach to Him”
Kinds of Tawassul
Is there a specific prayer for increasing provision?
Tawassul: Islamic vs. bid'ah

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