Shulchan Arukh, Yoreh De'ah Siman 260
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ובו סעיף אחד
מצות עשה לאב למול את בנו וגדולה מצוה זו משאר מצות עשה:
Translation v.1
It is a positive commandment for the father to circumcise is son. And this commandment is greater than all the other positive commandments.