الآية رقم (90) - أُوْلَـئِكَ الَّذِينَ هَدَى اللّهُ فَبِهُدَاهُمُ اقْتَدِهْ قُل لاَّ أَسْأَلُكُمْ عَلَيْهِ أَجْرًا إِنْ هُوَ إِلاَّ ذِكْرَى لِلْعَالَمِينَ

(90) - (Those are the ones whom Allah has guided, so from their guidance take an example. Say, "I ask of you for this message no payment. It is not but a reminder for the worlds.".)

Those were the Prophets (PBUT) whom Allah (swt) had granted guidance to, for them to guide humanity.

(… فَبِهُدَاهُمُ اقْتَدِهْ… ) (…so from their guidance take an example ): Among the previous Prophets were those who had possessed kingship, authority and power, and there were also those who had been inflicted with great trials. So, O Muhammad, take examples from those Prophets. For all the righteous and great characteristics that Allah (swt) has sent down for his Prophets and Messengers are gathered in the person of Prophet Muhammad (saws), the seal of the Prophets and the leader of the Messengers. Allah (swt) has said:

 لَقَدْ كَانَ لَكُمْ فِي رَسُولِ اللَّهِ أُسْوَةٌ حَسَنَةٌ لِّمَن كَانَ يَرْجُو اللَّهَ وَالْيَوْمَ الْآخِرَ وَذَكَرَ اللَّهَ كَثِيرًا

(Indeed, in the Messenger of Allah you have an excellent example for whoever has hope in Allah and the Last Day, and remembers Allah often) (Al-Ahzab: 21)

(… قُل لَّا أَسْأَلُكُمْ عَلَيْهِ أَجْرًا ۖ… ) (…Say, “I ask of you for this message no payment.): Guidance does not require any payment in return. The Prophet (saws) and all the Prophets before him (PBUT) did not request for rewards in return for their reformation of humanity. Instead, they were authorized by Allah (swt) to reform and guide humanity, and this was their message, upon them be peace.

(  إِنْ هُوَ إِلَّا ذِكْرَىٰ لِلْعَالَمِينَ… ) (…It is not but a reminder for the worlds.”): Both this straight path and the guidance which the Prophet (saws) was authorized with are reminders to the whole world. As such, the Holy Quran is called Zikr, which means ‘reminder’, as Allah (swt) has said:

 إِنَّا نَحْنُ نَزَّلْنَا الذِّكْرَ وَإِنَّا لَهُ لَحَافِظُونَ

(It is certainly We Who have revealed the Reminder, and it is certainly We Who will preserve it) (Al-Hijr: 9)

It is called Zikr (reminder) which is the opposite of ‘forgetting’. So, since the Holy Quran is with you all the time, it is called so.