Everyone Should Know " Ayatul Kursiy"

Ayatul Kursiy: Al- Baqarah:255

اللَّهُ لَا إِلَٰهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ ۚ لَا تَأْخُذُهُ سِنَةٌ وَلَا نَوْمٌ ۚ لَهُ مَا فِي السَّمَاوَاتِ وَمَا فِي الْأَرْضِ ۗ مَنْ ذَا الَّذِي يَشْفَعُ عِنْدَهُ إِلَّا بِإِذْنِهِ ۚ يَعْلَمُ مَا بَيْنَ أَيْدِيهِمْ وَمَا خَلْفَهُمْ ۖ وَلَا يُحِيطُونَ بِشَيْءٍ مِنْ عِلْمِهِ إِلَّا بِمَا شَاءَ ۚ وَسِعَ كُرْسِيُّهُ السَّمَاوَاتِ وَالْأَرْضَ ۖ وَلَا يَئُودُهُ حِفْظُهُمَا ۚ وَهُوَ الْعَلِيُّ الْعَظِيمُ

Allāhu Lā 'Ilāha 'Illā Huwa Al-Ĥayyu Al-Qayyūmu Lā Ta'khudhuhu Sinatun Wa Lā Nawmun Lahu Mā Fī As-Samāwāti Wa Mā Fī Al-'Arđi Man Dhā Al-Ladhī Yashfa`u `Indahu 'Illā Bi'idhnihi Ya`lamu Mā Bayna 'Aydīhim Wa Mā Khalfahum Wa Lā Yuĥīţūna Bishay'in Min `Ilmihi 'Illā Bimā Shā'a Wasi`a Kursīyuhu As-Samāwāti Wa Al-'Arđa Wa Lā Ya'ūduhu Ĥifžuhumā Wa Huwa Al-`Alīyu Al-`Ažīmu  

Allâh! Lâ ilâha illa Huwa (none has the right to be worshipped but He), the Ever Living, the One Who sustains and protects all that exists. Neither slumber, nor sleep overtake Him. To Him belongs whatever is in the heavens and whatever is on earth. Who is he that can intercede with Him except with His Permission? He knows what happens to them (His creatures) in this world, and what will happen to them in the Hereafter . And they will never compass anything of His Knowledge except that which He wills. His Kursî extends over the heavens and the earth, and He feels no fatigue in guarding and preserving them. And He is the Most High, the Most Great. [This Verse 2:255 is called Ayat-ul-Kursî.]—

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Ismul Lahi Adham- The Greatest Name of Allah

The Prophet (saas) said: Whenever Allah is call with it, Allah answers your prayers  

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اللّهُـمَّ إِنِّـي أَسْأَلُـكَ بِأَنَّ لَكَ الْحَـمْدُ لا إِلـهَ إِلاّ أَنْـتَ وَحْـدَكَ لا شَـريكَ لَـكَ المَنّـانُ يا بَديـعَ السَّمواتِ وَالأَرْضِ يا ذا الجَلالِ وَالإِكْـرام، يا حَـيُّ يا قَـيّومُ إِنِّـي أَسْأَلُـكَ الجَـنَّةَ وَأَعـوذُ بِـكَ مِنَ الـنّار

64.Allahumma innee as-aluka bianna lakal-hamd, la ilaha illa ant wahdaka la shareeka lak, almannan, ya badee'as-samawati wal-ard, ya thal-jalali wal-ikram, ya hayyu ya qayyoom, innee as-alukal-jannah, wa-a'oothu bika minan-nar.

O Allah, I ask You as unto You is all praise, none has the right to be worshipped except You, alone, without partner. You are the Benefactor. O Originator of the heavens and the Earth, O Possessor of majesty and honor, O Ever Living, O Self-Subsisting and Supporter of all, verily I ask You for Paradise and I take refuge with You from the Fire.

Reference: Abu Dawud, An-Nasa'i, Ibn Majah, At-Tirmithi. See also Al-Albani, Sahih Ibn Majah 2/329.