By his father, he shall succeed if he were true (to what he professed), or: By his father, he would enter heaven if he were true (to what he professed).
عَنِ النَّبِيِّ ﷺ بِهَذَا الْحَدِيثِ نَحْوَ حَدِيثِ مَالِكٍ غَيْرَ أَنَّهُ قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَفْلَحَ وَأَبِيهِ إِنْ صَدَقَ أَوْ دَخَلَ الْجَنَّةَ وَأَبِيهِ إِنْ صَدَقَ