Should I take other than Him [false] deities [while], if the Most Merciful intends for me some adversity, their intercession will not avail me at all, nor can they save me?
(He said: "O my people! Obey the Messengers.") -- he urged his people to follow the Messengers who had come to them.
اتَّبِعُواْ مَن لاَّ يَسْـَلُكُمْ أَجْراً
(Obey those who ask no wages of you,) means, `for the Message which they convey to you, and they are rightly-guided in what they are calling you to, the worship of Allah Alone with no partner or associate.'
وَمَا لِىَ لاَ أَعْبُدُ الَّذِى فَطَرَنِى
(And why should I not worship Him Who has created me) means, `and what is there to stop me from sincerely worshipping the One Who has created me, and worshipping Him Alone, with no partner or associate'
In verse 20, it was said: وَجَاءَ مِنْ أَقْصَى الْمَدِينَةِ رَجُلٌ يَسْعَىٰ (And there came a man rushing from the farthest part of the city.) In the first verse (13), the place where this incident transpired was expressed as: اَلقَریَۃ (al-qaryah: town) which, according to the Arabic lexical usage, does not signify a small village, instead, it means a habitation in the absolute sense. It may be a small habitation or a big city. Now, in this verse, this place has been identified as: اَمَدِینۃ (al-madinah), a name used only for a big city. From here, we learn that the habitation where this event took place was some big city. Hence, this too supports the saying where it has been identified as Antakiyah. The expression: أَقْصَى الْمَدِينَةِ (aqsal-madinah: farthest part of the city) means outskirts of the city. The word: يَسْعَىٰ as a rushing) in the phrase: رَجُلٌ يَسْعَىٰ has been derived from: سَعٰی يَسْعَىٰ (run) which means to walk in a running gait. Therefore, the expression would mean that a man came running from the farthest part of the city. Then, there are occasions when this word is also used in the sense of walking with concern, poise and sense of purpose to be accomplished - which may not include running- as in Surah Al-Jumu` ah: فَاسْعَوْا إِلَىٰ ذِكْرِ اللَّـهِ (fas` aw ila dhikril-lah: hasten for the remembrance of Allah (Khutbah and Salah of Jumu'ah) - 62:9). Here, this very sense is intended.
Both the prophets at that time were powerless. Nevertheless, this third man associated himself with them. In the struggle between truth and untruth, man has to take the side of the truth, even if it amounts to supporting the weak against the strong. The third man urged the people of his community to pay heed to the words of the earlier Prophets who were on the straight path and who did not seek any return for guiding rightly. This shows that in spite of a man being selfless and well-intentioned, his words will be examined in the light of reason, and will be deemed to be of value only if they measure up to the standard of reason.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.