HARRY
I need you to stay away from Scorpius Malfoy.

ALBUS
What? Scorpius?

HARRY
I don’t know how you became friends in the first place, but you did – and now – I need you to—

ALBUS
My best friend? My only friend?

HARRY
He’s dangerous.

Harry Potter and the Cursed Child - Chapter 2 :
See this quote in the Pensive -