3a] Ruling on praying tahajjud on Laylat al-Qadr only

3a]
With regard to singling out one night of Ramadaan as Laylat al-Qadr,
this requires evidence to show that it isthis night and not any other.
But the odd numbered nights of the last ten nights of Ramadaan are
more likelythan others (to be Laylat al-Qadr) and the twenty-seventh
night is the most likely night to be Laylat al-Qadr, because of the
ahaadeeth to that effect.
Fataawa al-Lajnah al-Daa'imah li'l-Buhooth al-'Ilmiyyah wa'l-Ifta', 10/413
Hence the Muslim should not assume that any particular night is Laylat
al-Qadr, because that would mean that he is being certain about
something concerning which we cannot be certain, and because it means
that he is missing out on something that is good for him. It may be
the night of the twenty-first, or the twenty-third, or the
twenty-ninth. If he spends the night of the twenty-seventh only in
prayer, then he will have missed out on a lot of goodness, and he may
have missed that blessed night.
The Muslim should strive his hardest to do acts of obedience and
worship throughout Ramadaan, and more so in the last ten days. This is
the teaching of the Prophet (peace and blessings of Allaah be upon
him).
It was narrated that 'Aa'ishah (may Allaah be pleased with her) said:
When the last ten days of Ramadaan began, the Prophet (peace and
blessings of Allaah be upon him) would tighten his waist-wrapper,
spend his nights in prayer, and wake his family.
Narrated by Muslim, 2024;Muslim, 1174.
And Allaah knows best.