"[Like those before you]" meaning: from among the disbelievers. "[They were mightier than you in power]." Muhammad said: The meaning is: Allah has promised you for [your] disbelief as He promised those before you, "[So they enjoyed their portion, and you enjoyed your portion, just as those before you enjoyed their portion]."

Tafsir al-Kalbi: He says: You enjoyed your share of the Hereafter in this world, just as those before you enjoyed their share of the Hereafter, "[and you indulged]" in disbelief and denial, "[as they indulged]."