أَمْسَيْنَا وَأَمْسَا الْمُلْكُ لِلَّهِ رَبِّ الْعَالَمِينَ، اللَّهُـمَّ إِنِّي أَسْأَلُكَ خَيْرَ هَذِهِ اللَّيْلَةِ :فَتْحَهَا، وَنَصْرَهَا، وَنُورَهَا، وَبَرَكَتَهَا، وَهُدَاهَا، وَأَعُوْذُ بِكَ مِنْ شَرِّ مَا فِيهَا وَشَرِّ مَا بَعْدَهَا

Amsaynaa wa 'amsal-mulku lillaahi Rabbil-'aalameen, Allaahumma 'innee 'as'aluka khayra haadhi hil-laylati, Fathahaa wa nasrahaa wa noorahaa, wa barakatahaa, wa hudaahaa, wa'A'oodhu bika min sharri maa feehaa wa sharri maa ba'dahaa.

We have reached the evening and at this very time all sovereignty belongs to Allah, Lord of the worlds. O Allah, I ask You for the good of this day, its triumphs and its victories, its light and its blessings and its guidance, and I take refuge in You from the evil of this day and the evil that follows it.

Reference: Abu Dawud 4/322, No. 5084