ENOfficial
‘A'isha reported God’s Messenger as saying, “If anyone prays twenty rak'as after the sunset prayer, God will build for him a house in paradise.” Tirmidhi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَائِشَةَ قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ صَلَّى بَعْدَ الْمَغْرِبِ عِشْرِينَ رَكْعَةً بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ» . رَوَاهُ التِّرْمِذِيّ
sunnah.com