The ruling on saying that "sad" is a letter from the creation of Allah

Question:
If someone says that "sad" is a letter from the creation of Allah, is that permissible, O Shaykh?

Answer:
Everything is from the creation of Allah. All the letters were created by Allah for the servants: sad, ya, lam, and mim. All of these are letters, because the speech of Allah is known; the speech of Allah is His attribute.
As for these letters, they are created, and He taught them to His servants. When they write them, that is from their work. They wrote sad, dad, and 'ayn, and all of it is from the work of the created beings. However, the speech itself, the speech of Allah (Exalted and Majestic is He), is the speech of Allah whether it is written, recited, or heard, and what is in the breasts is the speech of Allah, whether it is sad or otherwise. But the letters themselves, the ink itself, and the paper itself are from what Allah made and created. However, the recited text itself and the heard text itself are the speech of Allah.