Lamentations 3:44
"Thou hast covered thyself with a cloud, that our prayer should not pass through."
Cross References (ranked by relevance)
Also when I cry and shout, he shutteth out my prayer.
Therefore it is come to pass, that as he cried, and they would not hear; so they cried, and I would not hear, saith the LORD of hosts:
Clouds and darkness are round about him: righteousness and judgment are the habitation of his throne.
Then said the LORD unto me, Though Moses and Samuel stood before me, yet my mind could not be toward this people: cast them out of my sight, and let them go forth.
Then said the LORD unto me, Pray not for this people for their good.
O LORD God of hosts, how long wilt thou be angry against the prayer of thy people?