18-23
And do not say about anything, “”I will do that tomorrow,””
orders are given for saying ‘Insha Allah’ meaning ‘If Allah (SWT) wills’, before any future commitment.
18-25
And they stayed in their cave (for) three hundred years and add nine {1}.
These were some Christian young men who had taken shelter in a cave because the king of their time had ordered the killing of all those who refused idol worship (Verses:15,16). Their number, place and date of the happening are not mentioned probably to indicate the insignificance of details which have no moral value. They were kept sleeping for probably 300 solar years which are equivalent to 309 lunar years [one solar year is 10.95 days longer than a lunar year]. During sleep, they were unconscious of time. This incident hints at life after death and being unconscious of time during death (39:42).
300 Solar years are equal to 309 lunar years. The number of years is stated in both the systems probably to provide us with an exact equivalent.
18-27
And read that which has been communicated to you from the book of your Fosterer, there is none who can change His statements and you will never find any refuge beside Him.
Instructions are given regarding the study of the Quran, being in the company of the pious, avoiding glamour and sinners. The pious will be in paradise and the sinners in hell.
18-32
And set forth to them the similitude of two men: We had assigned to one of them two gardens of grapes and We had surrounded them both with date palms and placed between them fields (of vegetation).
The rich friend was proud and doubted the end of the world. He should have been grateful to Allah (SWT) for his possessions and said, “That which Allah willed (is in my possession), their is no power expect that of Allah.” After the destruction of his gardens he repented having associated partners with Allah (SWT) i.e. having given the credit of his welfare to his wealth and status and not to Allah (SWT) which too is polytheism. Regarding someone or something other than Allah (SWT) as our benefactor too is polytheism