Could you source this statement?
عون بن عبد الله قال: أوصى رجل ابنه، فقال: يا بني، عليك بتقوى الله، وإن استطعت أن تكون اليوم خيرا منك أمس، وغدا خيرا منك اليوم فافعل
‘Awn ibn Abdillah (rahimahullah) said, “A man advised his son saying: O my son! You should adopt Taqwa and if you are able to be better today than you were yesterday and to be better tomorrow than you are today, then do so.”
(Kitabuz Zuhd of Imam ‘Abdullah ibn Al Mubarak, Hadith: 846, pg. 254 and Hilyatul Awliya, vol. 4 pg. 263/264. Also see Musannaf Ibn Abi Shaybah, Hadith: 36741)
And Allah Ta’ala Knows best.
Answered by: Moulana Suhail Motala
Approved by: Moulana Muhammad Abasoomar
Checked by: Moulana Haroon Abasoomar
This answer was collected from HadithAnswers.com. The answers were either answered or checked by Moulana Haroon Abasoomar (rahimahullah) who was a Shaykhul Hadith in South Africa, or by his son, Moulana Muhammad Abasoomer (hafizahullah), who is a Hadith specialist.