how to copy paste particular raw every time cell value change

Hi friends

I am new here please help me my problem is as under
I have excel In sheet 1 there two cell having certain value first cell is a1 and second cell is b1. I want to copy and paste this two cell in sheet2 in first raw after any variation in cell value in a1 or b1 in sheet1 it should be automatically copy paste in sheet 2 next blank raw automatically . any VBA code pls
Pls help

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