An-Nisa 4:9

Walyakhsha allatheena law tarakoo minkhalfihim thurriyyatan diAAafan khafooAAalayhim falyattaqoo Allaha walyaqooloo qawlan sadeeda

And let those [executors and guardians] fear [injustice] as if they [themselves] had left weak offspring behind and feared for them. So let them fear Allāh and speak words of appropriate justice.

Those people should be fearful (in their behavior towards orphans) who, if they leave behind some helpless children, would remain anxious for them. So, they should fear Allah and say what is right.