Is the obsessive whisper (waswas) that urges one to recite specific invocations (adhkar) before ablution (wudu') and cleansing (istinja') for the purpose of distraction from worship, and what is the ruling on becoming engrossed in these invocations during ablution and cleansing?

Remembrance (dhikr) expels Satan and is one of the means of treating obsessive thoughts (waswasah). Therefore, one afflicted with waswasah should adhere to acts of remembrance and distract themselves from the obsessive thoughts. They should also persist in supplication and humble entreaty, while also considering consulting a trusted psychiatrist.