Pyrex glass will not shatter or break when you pour boiling water into it because the Pyrex is better able to withstand thermal shock.
So yes you can pour boiling water into a Pyrex dish without it breaking.
When you pour boiling water into a regular cold glass bowl or glass jar the glass will crack and break due to the sudden thermal shock from going from cold to suddenly hot.
But the Pyrex dishes are made differently and can withstand the thermal shock of the hot boiling water coming into contact with it so the Pyrex dish is safe to have boiling water poured into it without the risk of it cracking or breaking.