Al-An'am 6:140

Qad khasira allatheena qataloo awladahumsafahan bighayri AAilmin waharramoo ma razaqahumuAllahu iftiraan AAala Allahi qad dalloowama kanoo muhtadeen

They will have lost who killed their children in foolishness without knowledge and prohibited what Allāh had provided for them, inventing untruth about Allāh. They have gone astray and were not [rightly] guided.

Losers are those who kill their children foolishly, without knowledge, and hold as prohibited what Allah has provided them, falsely ascribing it to Allah. They have gone astray, and they are not on the right path.