A. Yusuf Ali:Translation:
And what burden Were it on them if they had faith in
Allah and in the Last Day, and they spent out of what
Allah have given them for sustenance? 558 For Allah
have full knowledge of them.

Muhammad Asad:Translation:
And what would they have to fear 50 if they would but believe in God and the Last Day, and spend [in His way] out of what God has granted them as sustenance - since God has indeed full knowledge of them?
558 Sustenance: physical, intellectual, spiritual-every thing 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.