Reference: Fataawa ash-Shaykh al-‘Allaamah Muhammad Naasiruddeen al-Albaanee fil-Madeenah wal-Imaaraat – Page 168
Fataawa al-Madeenah – Page 60
Question: Is it permissible for a Muslim to allocate specific supplications of remembrance for particular days, such that for every day, he allocates a specific supplication of remembrance?
Response: It is not permissible for a Muslim to do this, because in doing so there is an element of legislating [this practice], and this is not permissible for anyone to do, other than Allaah (Tabaaraka wa Ta’aala).