Amsaynā — evening remembrance
At sunset
أَمْسَيْنَا وَأَمْسَى الْمُلْكُ لِلَّهِ، وَالْحَمْدُ لِلَّهِ، لاَ إِلَٰهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ
Amsaynā wa amsā al-mulku lillāh, wa al-ḥamdu lillāh, lā ilāha illā Allāhu waḥdahu lā sharīka lahu, lahu al-mulku wa lahu al-ḥamdu wa huwa ʿalā kulli shayʾin qadīr.
"We have entered the evening, and the whole kingdom belongs to Allah. Praise is for Allah. There is no god but Allah alone, with no partner. His is the kingdom, to Him is the praise, and He is over all things capable."
Source: Ṣaḥīḥ Muslim 2723
Where the scholars teach this duʿāʾ.
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"from Allah for the people of Lot and to establish proof against them. Lot, peace be upon him, hosted them at sunset, fearing that if he did not, no one else would. He was distressed and anxious for them knowing the trial that awaited. Qadda mentioned that they approached him while he was working in his field, and he hosted them, being shy before them. He hinted that they might turn away from this town and settle elsewhere, saying, O people, I know of no townspeople worse than these. He repeated this four times. They had been ordered not to destroy them until their prophet bore witness against them."
— Ibn Kathir, Volume 1 — From Creation to Mūsā
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"It responds, I will not rise upon a people who worship me besides Allah. When it intends to rise, a devil tries to deter it, but it rises between its horns and burns him. At sunset, it intends to submit to Allah, and again a devil tries to deter it, but it sets between its horns and burns him. Ibn Asakir reported this in detail, including Umayyah's poetry about the bearers of the throne, From one who bears one of the pillars of his throne, If it were not for the God of all creation, they would all perish."
— Ibn Kathir, Volume 2 — From the Israelite Prophets to Pre-Islamic Arabia
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"maintaining remembrance, and breaking away from worldly distractions, hoping to receive some of those breezes. Ka‘b al-Ahbar believed that the special hour on Friday occurs at sunset. Abu Hurayrah questioned this, recalling that the Messenger of Allah, peace be upon him, said, "No servant meets it while praying. Ka‘b responded by reminding him that the Prophet also said, "Whoever sits waiting for prayer is in prayer."
— Imam al-Ghazali, Book 4: The Book of Prayer