Anas reported that Allah's Messenger (ﷺ) 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.
Source: sunnah.com
Other translations
Arabic
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 .
sunnah.com