While performing Tawaf, should we raise our hand and say BISMILLAH ALLAHU AKBAR at both rukn-e-yamani and Hajr-e-aswad or should we raise our hand and say the above only at the hajr-e-aswad.

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Only at Al Hajar Al Aswad.

I read two books from darussalam and both of them tell different things. Please clear my doubt. While performing Tawaf, should we raise our hand and say BISMILLAH ALLAHU AKBAR at both Rukn-e-yamani and Hajr-e-aswad or should we raise our hand and I read two books from darussalam and both of them tell different things. Please clear my doubt.