Mishkat al-Masabih
Mishkat al-Masabih 1369
وَعَنْ أَنَسٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ رَجَبٌ قَالَ: «اللَّهُمَّ بَارِكْ لَنَا فِي رَجَبٍ وَشَعْبَانَ وَبَلِّغْنَا رَمَضَانَ» قَالَ: وَكَانَ يَقُولُ: «لَيْلَةُ الْجُمُعَةِ لَيْلَةٌ أَغَرُّ وَيَوْمُ الْجُمُعَةِ يَوْمٌ أَزْهَرُ» . رَوَاهُ الْبَيْهَقِيُّ فِي الدَّعَوَاتِ الْكَبِيرِ
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Anas reported that when Rajab began, the Messenger of God would say: O God, bless us in Rajab and Sha’ban, and let us reach Ramadan. He also used to say: The night before Friday is bright, and Friday is a radiant day. Al-Bayhaqi transmitted it in al-Daawat al-Kabir.
Notes and open questions — unreviewed
The Arabic says the night of Friday, meaning Thursday night in ordinary English usage.