Why does Jehovah promise his worshippers a reward? By promising his worshippers a reward, Jehovah helps to sustain them during tests of integrity.
وَهٰذِهِ ٱلْبَرَكَةُ هِيَ أَهَمُّ بِكَثِيرٍ مِنْ أَيِّ تَضْحِيَةٍ يُقَدِّمُونَهَا مِنْ أَجْلِ ٱلْمَلَكُوتِ .‏