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[6] Tapi dua tahu setelah masa Umar menjadi khalifah, diputuskan perubahan mendasar. Talak tiga yang dijatuhkan dalam satu majelis diputuskan akan menjadi talak tiga betulan, sehingga tidak boleh lagi merujuk isteri.

Talak Tiga Sekaligus dan Tanpa Saksi (rumahfiqih.com)

[5] The word Sunnah (Arabic: سنة) is an Arabic word meaning "tradition" or "way." For Muslims, Sunnah means "the way of the prophet". Sunnites try to follow his words, actions and teachings. Muslim scholars learn about the Sunnah by studying thousands of stories about Muhammad, his family, and his first followers.

https://simple.wikipedia.org/wiki/Sunnah

[4] The term Rashidun Caliphate is derived from a famous hadith of Muhammad, where he foretold that the caliphate after him would last for 30 years (the length of the Rashidun Caliphate) and would then be followed by kingship (the Umayyad Caliphate was a hereditary monarchy). 

Rashidun Caliphate - Wikipedia

[3] Safinah (May Allah Most High be pleased with him) narrated that the Messenger of Allah ﷺ said: The Prophetic Khilaafah will be thirty years. Then Allah will give the kingdom or His kingdom to whomever He wills. (Sunan Abu Dawood, 4646).

How strong is the Hadith saying Khilafah will be 30 years? – Islam Answers

[2] Narrated `Abdullah bin `Umar: Once the Prophet led us in the `Isha' prayer during the last days of his life and after finishing it (the prayer) (with Taslim) he said: Do you realize (the importance of) this night? Nobody present on the surface of the earth tonight will be living after the completion of one hundred years from this night. 

Hadith 116 Of The Book Of Knowledge By Sahih Al Bukhari | IslamicFinder

No-one who was alive in 10 AH lived for more than one hundred years - Islam Question & Answer (islamqa.info)

[1] Terdapat riwayat dalam Shahih al-Bukhari bahwa Abu Hurairah –radhiyallahu ‘anhu– mengatakan, “Aku menghafal dari Nabi –shallallahu ‘alaihi wa sallam- dua bejana ilmu, satu bejana aku sebarkan sedangkan yang lainnya kusembunyikan. Seandainya (isi bejana yang kusembunyikan itu) kusebarkan, niscaya terputuslah tenggorokan ini.”

Tentang Abu Hurairah dan Dua Wadah Ilmu … « Tipongtuktuk (wordpress.com)