"Or take heed, so the reminder would benefit him." Al-Suddi said: The meaning is: Perhaps he may purify himself and take heed, and the alif is a connective (silah).
﴿أَو يذكر فتنفعه الذكرى﴾ قَالَ السُّدي: الْمَعْنَى: لَعَلَّهُ: يُزَّكَّى ويذّكّر وَالْألف صلَة