Surah Al-Qalam, Ayah 28

قَالُواْ سُبْحَـنَ رَبّنَآ إِنَّا كُنَّا ظَـلِمِينَ- فَأَقْبَلَ بَعْضُهُمْ عَلَى بَعْضٍ يَتَلَـوَمُونَ- قَالُواْ يوَيْلَنَآ إِنَّا كُنَّا طَـغِينَ- عَسَى رَبُّنَآ أَن يُبْدِلَنَا خَيْراً مّنْهَآ إِنَّآ إِلَى رَبّنَا رغِبُونَ- كَذَلِكَ الْعَذَابُ وَلَعَذَابُ الاْخِرَةِ أَكْبَرُ لَوْ كَانُواْ يَعْلَمُونَ-

قَالَ أَوْسَطُهُمْ أَلَمْ أَقُل لَّكُمْ لَوْلَا تُسَبِّحُونَ (Said he who was the best among them, "Did I not say to you, 'Why do you not pronounce tasbih (Allah's purity)?"....68:28). The middle brother was the best of them. He was righteous like his father. It used to please him to spend in the cause of Allah. He was not niggardly or stingy like the other brothers. He had advised them to recite tasbih which, literally, means to pronounce Allah's purity. He told them that they were withholding the share of the poor with the fear that their fruit will be depleted and will not be replenished by Allah, if they gave the poor their share. He told them that Allah is pure from such pettiness. Instead, those who spend in the way of Allah, He will not only make their wealth full again or replace what they have spent, but also will give them over and above what they have spent. [ Mazhari ].

‘Do not give in to the deniers of truth’ means that the words of those who deny the truth are not worthy of acceptance. On the one hand, there is the upholder of Truth, who has taken his stand by virtue of reasoning. There is no contradiction between his words and his actions. On the other hand, there are his opponents who are of low character and have nothing to their credit except for false utterances. The missionary of Truth relies on Truth, whereas his opponents rely on their material status. The missionary of Truth is a follower of principles, unlike his opponents who are unprincipled, and whose views are highly inconsistent. For one who has a sound mind, this difference is enough to show who is on the right path and who is not.