Amr bin Murrah said: I asked Sa'id bin Jubayr about this verse: "And those who believed and whose descendants followed them in faith" [Surah al-Tur: 21].
Ibn Abbas (may Allah be pleased with them both) said that Allah will join the believer's descendants with him so that his eyes may be cooled, even if they are below him in deeds.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الدعوى والبينات / 21290