Explanation

Must remember all 12 Islamic months name

List of Islamic Months

1. Muḥarram, محرم الحرام
   
2. Ṣafar, صفر المظفر
3. Rabi al Awwal ربیع الاول
4. Rabi al Sani ربیع الثانی
5. Jumada al Awwal جمادی الاول
6. Jumada al Thani جمادی الثانی
7. Rajab, رجب المرجب
8. Shabanشعبان المعظم
9. Ramadan(fasting), رمضان المبارک
10. Shawwal شوال المکرم
11. Dhu al Qadah ذوالقعدۃ الحرام
12. Dhu al Hijjah ذوالحجۃ الحرام:

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Each month begins approximately at the time of the new moon.

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RK220123

Explanation

Abd-Allah ibn Ubayy, also called Ibn Salul in reference to his grandfather, was a chief of the Arab tribe Banu Khazraj and one of the leading men of Medina.

Upon the arrival of the Islamic prophet Muhammad, Ibn Ubayy seemingly became a Muslim, but remained treacherous to Islam until his death. 

Explanation

Namaz commanded in Quran for 700 times.

Salat made compulsory in 10th Hijri.

Salat Juma became Farz in Madina.

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It was fell from Jannah

It is considered  that it's original color was white due to peoples sin who touch it converts into black

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