لم يحك نائلك السحاب
The cloud could not imitate your generosity.
The poetic scene treats the cloud as though it could compare itself with the patron’s giving and feel unable to match it. Its raining then receives a fitting but imagined cause.
Event: the clouds release rain.
Imagined cause: distress at failing to rival the patron.
Purpose: to elevate the patron’s generosity through expressive imagery.