Jabir (May Allah be pleased with him) reported:
The Prophet (PBUH) said, "For him who says:
`Subhan-Allahi wa bi hamdihi
(Allah is free from imperfection, and I begin
with praising Him, and to Him),'
a palm-tree will be planted in Jannah.''
[At-Tirmidhi].
Commentary: Jannah is so vast that we cannot even
imagine its vastness. The planting of trees in return for
the Praise and Glorification of Allah is, therefore, neither
something difficult nor surprising. So, there should not be
any hesitation in accepting it as a fact. Some people
take it is as a metaphor for a plentiful reward.