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

This hadeeth came to me on my phone, and I want to know how sound it is:
it was narrated that the Prophet (blessings and peace of Allah be upon
him) said: "Whoever says in Rajab 'I ask Allah for forgiveness, there
is no God but He alone, with no partner or associate, and I repent to
Him' one hundred times, and ends it with charity, Allah will decree
for him mercy and forgiveness. And whoever says it four hundred times,
Allah will decree for him the reward of one hundred martyrs."
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Praise be to Allah.
There is no basis for this hadeeth in the books of Sunnah and reports,
and no narration is known for it with any of the scholars. Similarly,
we could not find it in the books which deal with false and fabricated
hadeeths.
Rather we found it in some of the books of the Shi'ah that are filled
with fabricated reports that are narrated without any isnaad or proof.
It was mentioned by Ibn Tawoos – 'Ali ibn Moosa ibn Ja'far (d. 664 AH)
– in his bookIqbaal al-A'maal(3/216). But we did not find any basis
for this hadeeth in any earlier book of the Shi'ah. Ibn Tawoos
mentioned it in a comment without any isnaad, and said:
Chapter on what we have mentioned about the virtue of seeking
forgiveness, repeating Laa ilaaha ill-Allah and repenting in the month
of Rajab. We found this narrated from the Prophet (may Allah send
blessings upon him and his family), that he said: "Whoever says in
Rajab 'I ask Allah for forgiveness, there is no God but He alone, with
no partner or associate, and I repent to Him' one hundred times, and
ends it with charity, Allah will decree for him mercy and forgiveness.
And whoever says it four hundred times, Allah will decree for him the
reward of one hundred martyrs, and when he meets Allah on the Day of
Resurrection, He will say to him: You affirmed My sovereignty, so wish
for whatever you want so that I may give it to you, for there is none
who prevails but Me."
It was transmitted from him in some of the other books, such
asWasaa'il ash-Shi'ah(10/484) by al-Hurr al-'Aamili (d. 1104 AH) and
others.
Thus the signs of fabrication in this hadeeth become clear:
Firstly:
The hadeeth is devoid of any isnaad.
Secondly:
It is only the books of the Raafidah that mention this hadeeth. From
their books the hadeeth has become well known in some Internet chat
rooms and websites. Hence it is essential to be cautious about many of
the hadeeths that are quoted in chat rooms when their sources are the
fabricated books of the Raafidis.
Thirdly:
The hadeeth has to do with the virtues of the month of Rajab. We must
be cautious about all reports that speak of this matter, because there
are so many fabricated reports concerning it that some of the scholars
wrote books dealing specifically with that, such as al-Haafiz Ibn
Hajar (may Allah have mercy on him) in his bookTabyeen al-'Ajab bima
wurida fi Fadl Rajab. He (may Allah have mercy on him) said:
No saheeh hadeeth that is fit to be used as evidence has been narrated
concerning the virtue of the month of Rajab or of fasting that month
or any specific part of it, or praying qiyaam al-layl specifically
during that month. This has been stated categorically before me by
Imam Abu Ismaa'eel al-Harawi al-Haafiz, and we have narrated it from
him with a saheeh isnaad as we also narrated it from others. But it is
well known that the scholars are deviant in narrating hadeeths about
virtues, even if they are da'eef, so long as they are not fabricated.
Nevertheless we should stipulate that the one who does that should
believe that the hadeeth is da'eef and he should not make it
well-known, lest people act upon a da 'eef hadeeth and prescribe
something that is not prescribed, or lest some of the ignorant see
that and think that it is a saheeh Sunnah.
End quote fromTabyeen al-'Ajab(p. 11)
Fourthly:
Exaggeration about the reward, whereby a small deed in the month of
Rajab is said to bring the reward of one hundred martyrs and more.
Such as it is not narrated in the saheeh reports.
And Allah knows best.