Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrated from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "The affair of this community (ummah) will remain close (to what is right) or well-ordered, until they begin to speak about (the fate of) children and about divine decree (qadar)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12709