حَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ، أَخْبَرَنَا يَزِيدُ بْنُ زُرَيْعٍ، عَنْ حُمَيْدٍ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، ح. وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ الْفَزَارِيُّ، حَدَّثَنَا حُمَيْدٌ، حَدَّثَنِي ثَابِتٌ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم رَأَىَ شَيْخًا يُهَادَى بَيْنَ ابْنَيْهِ فَقَالَ ‏"‏ مَا بَالُ هَذَا ‏"‏ ‏.‏ قَالُوا نَذَرَ أَنْ يَمْشِيَ ‏.‏ قَالَ ‏"‏ إِنَّ اللَّهَ عَنْ تَعْذِيبِ هَذَا نَفْسَهُ لَغَنِيٌّ ‏"‏ ‏.‏ وَأَمَرَهُ أَنْ يَرْكَبَ ‏.‏

Anas reported that Allah's Apostle (PBUH) saw an old man being supported between his two sons. He (the Holy Prophet) said: What is the matter with him? They said: He had taken the vow to walk (on foot to the Ka'ba). Thereupon he (Allah's Apoitle) said: Allah is indifferent to his inflicting upon himself chastisement, and he commanded him to ride. Translation Not Available

Book Ref: Sahih Muslim Book 26 Hadith 4029
Web Ref:  Sahih Muslim Book 14 Hadith 1642