Ali bin Rabia reported,

I saw Ali brought a riding animal to mount. When he placed his foot in the stirrup, he said, "In the name of Allah." When he settled upon it, he said, "Praise be to Allah. Glory to the One who has subjected this to us, and we could never have done it ourselves. And indeed, to our Lord we will return" [Zukhruf 43:13–14]. Then he praised Allah three times and proclaimed His greatness three times, then said, "Glory be to You. There is no god but You. I have wronged myself, so forgive me." Then he laughed.I asked, "What made you laugh, Commander of the Faithful?"He said, "I saw the Messenger of Allah ﷺ do exactly as I have done, then he laughed. I asked, 'What made you laugh, Messenger of Allah?'He replied, 'The Lord marvels at His servant when he says, "My Lord, forgive me," and He says, "My servant knows that none forgives sins but Me."'"

حدثنا يزيد أنبأنا شريك بن عبد الله عن أبي إسحاق

عن علي بن ربيعة قال

رأيت عليا رضي الله عنه أتي بدابة ليركبها فلما وضع رجله في الركاب قال بسم الله فلما استوى عليها قال الحمد لله سبحان الذي سخر لنا هذا وما كنا له مقرنين وإنا إلى ربنا لمنقلبون ثم حمد الله ثلاثا وكبر ثلاثا ثم قال سبحانك لا إله إلا أنت قد ظلمت نفسي فاغفر لي ثم ضحك فقلت مم ضحكت يا أمير المؤمنين قال رأيت رسول الله ﷺ فعل مثل ما فعلت ثم ضحك فقلت مم ضحكت يا رسول الله قال يعجب الرب من عبده إذا قال رب اغفر لي ويقول علم عبدي أنه لا يغفر الذنوب غيري