It is highly advisable to engage yourself in glorification of Almighty Allah and implorations for His forgiveness, because this hour is as important as the pre-sunrise hour, as Almighty Allah has said in the Holy Quran:
And sing the praise of your Lord before the rising of the sun and before the setting.
Imam al-Sadiq (`a) is reported to have said, “When the color of the sun changes (i.e. the sun is about to set), you must remember Allah the Almighty and Majestic. If you are at that hour with one who preoccupies you from this, you must leave him and supplicate.
امْسَىٰ ظُلْمِي مُسْتَجِيراً بِعَفْوِكَ
amsa zulmi mustajiran bi`afwika
In this evening, my wrongdoing is taking shelter in Your pardon,
wa amsa wajhiya albali mustajiran biwajhika aldda'imi albaqi
and my mortal face is taking shelter in Your Face, the Undying and Perpetual.
اللَّهُمَّ الْبِسْنِي عَافِيَتَكَ
allahumma albisni `afiyataka
O Allah, (please) dress me with Your wellbeing,
wa ghashshini birahmatika
cover me with Your mercy,
wa jallilni karamataka
overshadow me with Your honoring,
وَقِنِي شَرَّ خَلْقِكَ مِنَ ٱلْجِنِّ وَٱلإِنْسِ
wa qini sharra khalqika min aljinni wal-insi
and protect me against the evils of Your creatures—jinn and men.
يَا اللَّهُ يَا رَحْمٰنُ يَا رَحِيمُ
ya allahu ya rahmanu ya rahimu
O Allah! O All-beneficent! O All-merciful!
Continue the supplication to be said at sunset as under:
يَا مَنْ خَتَمَ ٱلنُّبُوَّةَ بِمُحَمَّدٍ
ya man khatama alnnubuwwata bimuhammadin
O He Who has sealed the Prophethood with Muhammad,
صَلَّىٰ ٱللَّهُ عَلَيْهِ وَآلِهِ
salla allahu `alayhi wa alihi
Allah may bless him and his Household,
إِخْتِمْ لِي فِي يَوْمِي هٰذَا بِخَيْرٍ
ikhtim li fi yawmi hadha bikhayrin
(please) seal with goodness this day of mine,
wa shahri bikhayrin
this month of mine,
wa sanati bikhayrin
this year of mine,
wa `umri bikhayrin
and my entire lifetime.
You may say the words of professing that there is no god save Allah and the words of seeking His protection, . You may then put your hand on the head and pass it over your face.
You may then hold your beard and say the following
احَطْتُ عَلَىٰ نَفْسِي وَاهْلِي
ahattu `ala nafsi wa ahli
I include myself, my family,
wa mali wa waladi
my property, and my sons,
مِنْ غَائِبٍ وَشَاهِدٍ
min gha'ibin wa shahidin
both the absent and the present
بِٱللَّهِ ٱلَّذِي لاَ إِلٰهَ إِلاََّ هُوَ
billahi alladhi la ilaha illa huwa
with Allah save Whom there is no god,
عَالِمُ ٱلْغَيْبِ وَٱلشَّهَادَةِ
`alimu alghaybi walshshahadati
the Knower of the unseen and the seen,
the All-beneficent, the All-merciful,
the Ever-living, the Self-subsisting.
لاَ تَاخُذُهُ سِنَةٌ وَلاَ نَوْمٌ
la ta'khudhuhu sinatun wa la nawmun
Slumber does not overtake Him nor sleep.
لَهُ مَا فِي ٱلسَّمَاوَاتِ وَمَا فِي ٱلارْضِ
lahu ma fi alssamawati wa ma fi al-ardi
Whatever is in the heavens and whatever is in the earth is His.
O Allah Self Sufficiency belongs to You and for me is the dependency in Your Presence You are rich and I am indigent forgive my laxities, conceal my sins, and today fulfill my desires, and whatever sins You are aware of, don't chastise me, but put me in Your mercy and Generosity
O the center of piety, O the possessor of forgiveness, O the most generous for the doers of good. You are more generous than my father, my mother and the entire universe. Pass my life in fulfilling my desires. Accept my prayers, have mercy on my voice, You have averted various types of difficulties from me.