وَكَانَ لَهُ ثَمَرٌ

And he had Thamar,

It was said that what was meant here was wealth, and it was said that what was meant were fruits, which is the more apparent meaning here.

This is also supported by the alternative recitation, Thumr, which is the plural of Thamrah (fruit) just as Khushb is the plural of Khashab (wood). Others recite it as Thamar.
 
فَقَالَ

and he said

the owner of the two gardens
 
لِصَاحِبِهِ وَهُوَ يُحَاوِرُهُ

to his companion in the course of discussion,

means, while he was disputing with him and boasting to him and showing off,
 
أَنَا أَكْثَرُ مِنكَ مَالاً وَأَعَزُّ نَفَرًا
 
 

I am greater than you in wealth and have a mightier entourage.

meaning, `I have more servants, attendants and children.'

Qatadah said,

"This, by Allah, is the wish of the immoral to have a lot of wealth and a large entourage.