The evening protection doa is: 'Allahumma bika amsayna wa bika asbahna wa bika nahya wa bika namutu wa ilaykal-masir.' It means: O Allah, by You we enter the evening and by You we enter the morning, by You we live and by You we die, and to You is the final return.
اللَّهُمَّ بِكَ أَمْسَيْنَا وَبِكَ أَصْبَحْنَا وَبِكَ نَحْيَا وَبِكَ نَمُوتُ وَإِلَيْكَ الْمَصِيرُ
Allahumma bika amsayna wa bika asbahna wa bika nahya wa bika namutu wa ilaykal-masir.
Meaning: O Allah, by You we enter the evening and by You we enter the morning, by You we live and by You we die, and to You is the final return.
Source: Sunan al-Tirmidhi #3391Doa ini acknowledges Allah's complete sovereignty over our existence — from waking to sleeping, from living to dying. It places complete trust in Allah as the evening arrives, seeking His protection through the night. Nabi (shallallahu alaihi wa sallam) never abandoned this evening doa.
اللَّهُمَّ بِكَ أَمْسَيْنَا وَبِكَ أَصْبَحْنَا وَبِكَ نَحْيَا وَبِكَ نَمُوتُ وَإِلَيْكَ الْمَصِيرُ
The Prophet (peace be upon him) used to say in the morning: 'Allahumma bika asbahna wa bika amsayna wa bika nahya wa bika namutu wa ilaykan-nushur,' and in the evening he would say: 'Allahumma bika amsayna wa bika asbahna wa bika nahya wa bika namutu wa ilaykal-masir.'