By the fig and the olive
1- Referring to the places known for their production, i.e., Damascus and Jerusalem, respectively. It could also refer to the fig and olive trees or to the fruits themselves.
And [by] Mount Sinai
وَهَٰذَا ٱلۡبَلَدِ ٱلۡأَمِينِ
And [by] this secure city [i.e., Makkah],
لَقَدۡ خَلَقۡنَا ٱلۡإِنسَٰنَ فِيٓ أَحۡسَنِ تَقۡوِيمٖ
We have certainly created man in the best of stature;
1- i.e., upright, symmetrical, and balanced in form and nature.
ثُمَّ رَدَدۡنَٰهُ أَسۡفَلَ سَٰفِلِينَ
Then We return him to the lowest of the low,
1- This can refer to the depths of Hell, to decrepit old age or to immorality.
إِلَّا ٱلَّذِينَ ءَامَنُواْ وَعَمِلُواْ ٱلصَّـٰلِحَٰتِ فَلَهُمۡ أَجۡرٌ غَيۡرُ مَمۡنُونٖ
Except for those who believe and do righteous deeds, for they will have a reward uninterrupted.
فَمَا يُكَذِّبُكَ بَعۡدُ بِٱلدِّينِ
So what yet causes you to deny the Recompense?
1- More literally, "What makes you lie concerning it?"
أَلَيۡسَ ٱللَّهُ بِأَحۡكَمِ ٱلۡحَٰكِمِينَ
Is not AllŒh the most just of judges?