Hadith: O Musa, if the seven heavens and their inhabitants – other than Me – and the seven earths were placed on one side of the scale and "Laa ilaaha illa Allah" (There is no god but Allah) was placed on the other side, the scale would tip to the side with "Laa ilaaha illa Allah".
عن أبي سعيد الخدري -رضي الله عنه- عن رسول الله -صلى الله عليه وسلم- قال: "قال موسى: يا رب علمني شيئا أذكرك وأدعوك به، قال: قل يا موسى: لا إله إلا الله، قال: يا رب كل عبادك يقولون هذا، قال: يا موسى لو أن السموات السبع وعَامِرَهُنَّ غيري والأَرَضِينَ السبع في كِفَّةٍ، ولا إله إلا الله في كِفَّةٍ، مَالَتْ بهن لا إله إلا الله". [ضعيف.] - [سنن النسائي الكبرى.] المزيــد ...
Abu Sa`eed al-Khudri, may Allah be pleased with him, reported that the Messenger of Allah, may Allah's peace and blessings be upon him, said: "Musa (Moses) said: 'O my Lord, teach me something by which I mention You and invoke You.' Allah said, 'O Musa, say, "Laa ilaaha illa Allah (There is no god but Allah)".' He (Musa) said, 'O my Lord, all Your slaves say that.' Allah said, 'O Musa, if the seven heavens and their inhabitants – other than Me – and the seven earths were placed on one side of the scale and "Laa ilaaha illa Allah" was placed on the other side, the scale would tip to the side with "Laa ilaaha illa Allah".' "
Musa (Moses), peace be upon him, asked his Lord, may He be Glorified and Exalted, to teach him words of Dhikr (remembrance of Allah) by which he would praise Him and implore Him. So Allah directed him to say "Laa ilaaha illa Allah" (There is no deity worthy of worship except Allah). Musa realized that this Dhikr was frequently mentioned by people, and he wished to have a special Dhikr by which he would be distinguished from everyone else. Thereupon Allah the Exalted explained to him the great merit of this statement to which He guided him and that nothing is parallel to it. He told him that if that statement is placed on one side of the scale and the seven heavens and their inhabitants – apart from Allah – and the seven earths, great as they are, were placed on the other side, the scale would tip with "Laa ilaaha illa Allah," because it is the basis of every religion and the foundation of every creed.
This Hadith is weak, but it is established that the Shahaadah (the testimony of faith: Laa ilaaha illa Allah) is the most virtuous of words. Al-Bukhari narrated that the Prophet, may Allah's peace and blessings be upon him, said: "The best of speech is four: Subhaan Allah (Glory be to Allah), Al-Hamdulillah (Praise be to Allah), Laa ilaaha illa Allah (There is no God but Allah), and Allahu Akbar (Allah is Greatest)." Ahmad narrated from `Umar that he said: "The phrase that he (the Prophet) wanted his uncle to say was the Shahaadah of Laa ilaaha illa Allah." Talhah said, "You have spoken the truth. If he he had known a phrase more virtuous than it he would have commanded him to say it."
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