What is the difference between (be) covered in & (be) covered with?
 

What is the difference between (be) covered in & (be) covered with?
The Longman Dictionary of Contemporary English provides an answer.

When cover means “hide or protect,” use with:
She covered the child with a blanket.
He covered his face with his hands.
The dictionary also gives an example with the preposition by: She wore a ... dress partly covered by a thin shawl.

When cover means “form a layer on a surface,” use either with or in:

The eruption of the volcano covered the town with/in fine ash.
So the preposition to use with the passive (as in your question) depends on the meaning of the word cover in the sentence.

شكرا جزيلا لحضرتك مستر احمد شكرا

thaaaaaaaaanks alot