الصَّابِرِينَ
(They are) those who are patient,
while performing acts of obedience and abandoning the prohibitions.
وَالصَّادِقِينَ
those who are true,
concerning their proclamation of faith, by performing the difficult deeds.
وَالْقَانِتِينَ
and obedient,
meaning, they submit and obey Allah,
وَالْمُنفِقِينَ
those who spend,
from their wealth on all the acts of obedience they were commanded, being kind to kith and kin, helping the needy, and comforting the destitute.
وَالْمُسْتَغْفِرِينَ بِالَاسْحَارِ
and those who pray and beg Allah's pardon in the last hours of the night.
and this testifies to the virtue of seeking Allah's forgiveness in the latter part of the night.
It was reported that when Yaqub said to his children,
سَوْفَ أَسْتَغْفِرُ لَكُمْ رَبِّيَ
(I will ask my Lord for forgiveness for you) (12;98) he waited until the latter part of the night to say his supplication.
Furthermore, the Two Sahihs, the Musnad and Sunan collections recorded through several Companions that the Messenger of Allah said,
يَنْزِلُ اللهُ تَبَارَكَ وَتَعَالى فِي كُلِّ لَيْلَةٍ إِلى سَمَاءِ الدُّنْيَا حِينَ يَبْقَى ثُلُثُ اللَّيْلِ الاْخِرُ فَيَقُولُ
هَلْ مِنْ سَايِلٍ فَأُعْطِيَهُ
هَلْ مِنْ دَاعٍ فَأَسْتَجِيبَ لَهُ
هَلْ مِنْ مُسْتَغْفِرٍ فَأَغْفِرَ لَهُ
Every night, when the last third of it remains, our Lord, the Blessed, the Superior, descends to the lowest heaven saying,
"Is there anyone to ask Me, so that I may grant him his request?
Is there anyone to invoke Me, so that I may respond to his invocation?
Is there anyone seeking My forgiveness, so that I may forgive him?"
The Two Sahihs recorded that Aishah said,
"The Messenger of Allah performed Witr during the first part, the middle and latter parts of the night. Then, later (in his life), he would perform it (only) during the latter part."
Abdullah bin Umar used to pray during the night and would ask,
"O Nafi! Is it the latter part of the night yet?"
and if Nafi said, "Yes," Ibn Umar would start supplicating to Allah and seeking His forgiveness until dawn.
This Hadith was collected by Ibn Abi Hatim