Surah Al-Qalam, Ayah 22

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-

فَتَنَادَوْا مُصْبِحِينَ (So, they called out each other as the morning broke 68:21). This means that they starting waking up each other in the early morning that they should set out early if they wanted to harvest.

وَهُمْ يَتَخَافَتُونَ (...while they were whispering to each other ... 68:23). They were speaking in a low voice, lest a poor man should hear their talk and accompany them.

‘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.