وَمَاذَا عَلَيْهِمْ لَوْ ءَامَنُوا۟ بِٱللَّهِ وَٱلْيَوْمِ ٱلْـَٔاخِرِ وَأَنفَقُوا۟ مِمَّا رَزَقَهُمُ ٱللَّهُ ۚ وَكَانَ ٱللَّهُ بِهِمْ عَلِيمًا Qur’an An-Nisaa' (4:39)Wam atha AAalayhim law a manoo bi A ll a hi wa a lyawmi al a khiri waanfaqoo mimm a razaqahumu All a hu wak a na All a hu bihim AAaleem a n
Lit., "what is it that would be upon them". This seems to be a reference to the oft-repeated Qur'anic statement that those who believe in God and live righteously "need have no fear" (la khawf 'alayhim - lit., "no fear [shall be] upon them").
Sustenance: physical, intellectual, spiritual-everything pertaining to life and growth. Our being is from Allah, and we must therefore spend ourselves freely for Allah. How can it be a burden? It is merely a response to the demand of our own healthy nature.