The hadeeth “Whoever says in Rajab ‘I ask Allah for forgiveness, there is no god but He’…” is fabricated and is not saheeh

No File Exists
Check below answers in case you are looking for other related questions:
Fasting in the month of Rajab
The hadeeth “O Allah, bless us in Rajab and Sha‘baan, and let us reach Ramadan” is da‘eef (weak) and not saheeh (sound)

No File Exists
Related Answers:
The soul's connection to the body
Physical action is an essential part of faith without which faith is not sound
Is seeing Allaah is a dream possible?
Fasting in the month of Rajab
The hadeeth “O Allah, bless us in Rajab and Sha‘baan, and let us reach Ramadan” is da‘eef (weak) and not saheeh (sound)

Recommended answers for you:
Ruling on jihad and kinds of jihad
Places and times where du’aa’ is answered
Jinn Possession
Eating food that is distributed on the Prophet’s Birthday (Mawlid)
There is nothing in Islam to say that anal intercourse is permissible