"Indeed in that is a sign," for recognizing that the One who caused these pairs to grow in the earth is capable of resurrecting the dead. "And most of them were not believers," meaning: those who have passed away from the nations.
﴿إِن فِي ذَلِك لآيَة﴾ لَمَعْرِفَةً بِأَنَّ الَّذِي أَنْبَتَ هَذِهِ الْأَزْوَاجَ فِي الْأَرْضِ قَادِرٌ عَلَى أَنْ يُحْيِيَ الْمَوْتَى ﴿وَمَا كَانَ أَكْثَرهم مُؤمنين﴾ يَعْنِي: مَنْ مَضَى مِنَ الْأُمَمِ