Muwatta Malik, Book 20, Hadith 917 (In-Book)

Yahya related to me from Malik that he had heard that Umar ibn al-Khattab used to stop at the first two jamras for such a long time that someone standing up would get tired.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَقِفُ عِنْدَ الْجَمْرَتَيْنِ الأُولَيَيْنِ وُقُوفًا طَوِيلاً حَتَّى يَمَلَّ الْقَائِمُ ‏.‏

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also referenced under: Book 20, Hadith 220 (USC-MSA)