Editing Muhammad (section)

===Farewell pilgrimage===
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 [[File:Maome.jpg|thumb|Anonymous illustration of [[al-Biruni]]'s ''[[The Remaining Signs of Past Centuries]]'', depicting Muhammad [[Islamic calendar#Prohibiting Nasī'|prohibiting Nasī']] during the [[Farewell Pilgrimage]], 17th-century Ottoman copy of a 14th-century ([[Ilkhanate]]) manuscript (Edinburgh codex)]]
{{Main|Farewell Pilgrimage}}
{{See also|Ghadir Khumm}}
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</div>On February 631, Muhammad received a revelation granting idolaters four months of grace, after which the Muslims would attack, kill, and plunder them wherever they met.{{sfn|Glubb|2001|pp=344–345, 359}}{{sfn|Gabriel|2014|p=200}}

During the 632 pilgrimage season, Muhammad personally led the ceremonies and gave a sermon. Among the key points highlighted are said to have been the prohibition of usury and vendettas related to past murders from the pre-Islamic era; the brotherhood of all Muslims; and the adoption of twelve lunar months without [[Intercalation (timekeeping)|intercalation]].{{sfn|Glubb|2001|p=358}}{{sfn|Rodinson|2021|pp=285–286}}