Praise be to Allaah.
This is mentioned in some ahaadeeth, but there is some
scholarly difference of opinion as to the soundness of those ahaadeeth.
There is no saheeh hadeeth concerning the virtue of the night of the
fifteenth of Sha’baan.
It was narrated from Abu Moosa al-Ash’ari that the Messenger
of Allaah (peace and blessings of Allaah be upon him) said: “Allaah
looks down on the night of the fifteenth of Sha’baan and forgives all his
creation except a mushrik or one who harbours hatred against the Muslims.”
Narrated by Ibn Maajah, 1390.
The “one who harbours hatred against the Muslims” means one
who has enmity towards a Muslim brother.
In al-Zawaa’id it says: Its isnaad is da’eef, because
‘Abd-Allaah ibn Lahee’ah is da’eef (weak) and al-Waleed ibn Muslim is
mudallis.
There is also some idtiraab (weakness) in the hadeeth, as
stated by al-Daaraqutni in al-‘Ilal, 6/50, 51. He said: This hadeeth
is not proven.
It was narrated from
Mu’aadh ibn Jabal, ‘Aa’ishah, Abu Hurayrah, Abu Tha’labah al-Khushani and
others, but the isnaads are not free of some weakness, and some of them are
very weak.
Ibn Rajab al-Hanbali said:
Concerning the virtue of
the night of the fifteenth of Sha’baan there are numerous ahaadeeth,
concerning which the scholars differed, but most of them classed them as
da’eef, and Ibn Hibbaan classed some of them as saheeh.
Lataa’if al-Ma’aazif, 261.
Allaah’s descending to the first heaven does not only happen
on the night of the fifteenth of Sha’baan, rather it is proven in
al-Saheehayn and elsewhere that Allaah descends to the first heaven
every night, in the last third of the night. The night of the fifteenth of
Sha’baan is included in this general meaning.
Hence, when ‘Abd-Allaah ibn al-Mubaarak was asked about the
descent of Allaah on the night of the fifteenth of Sha’baan, he said to the
one who asked him: “O weak one! The night of the fifteenth?! He descends
every night!”
Narrated by Abu ‘Uthmaan al-Saabooni in I’tiqaad Ahl
al-Sunnah, no. 92.
Al-‘Aqeeli (may Allaah
have mercy on him) said:
With regard to Allaah’s descending on the night of the
fifteenth of Sha’baan there are ahaadeeth which are weak, but the reports
that He descends every night are proven and saheeh, so the night of the
fifteenth of Sha’baan is included in that, in sha Allaah.
Al-Du’afa’, 3/29.
See also the answer to question no.
8907.
On this site you
can also find an article by Shaykh Ibn Baz (may Allaah have mercy on him)
concerning the ruling on celebrating the night of the fifteenth of Sha’baan.
You can find it under the heading,
Periodic Topics (under “Useful Material”
on the Islam Q&A Library page).