Word by Word Analysis

وَأَلَّوِ ٱسْتَقَـٰمُوا۟ عَلَى ٱلطَّرِيقَةِ لَأَسْقَيْنَـٰهُم مَّآءً غَدَقًا 16

And [Allāh revealed] that if they had remained straight on the way, We would have given them abundant rain [i.e., provision].