I wanted to ask that if I go to Imam Hussain's shrine and fall in sujood is it wrong? Why do sunnis call it shirk?

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It is fine as long as it is not with intention of worship

I wanted to ask that if I go to Imam Hussain's shrine and fall in sujood is it wrong? why do sunnis call it shirk?

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If you do sujood to Allah swt thanking Him for such great blessing.
If bow down to kiss the holy ground only and thank Allah swt then it is ok even recommended in some text. Because bowing down in sujood has to be for Allah swt only.