When he came to his Lord with a pure heart [attached to - Surah As-saffat ayat 84 in English

﴿إِذۡ جَآءَ رَبَّهُۥ بِقَلۡبٖ سَلِيمٍ ﴾
[الصَّافَات: 84]

When he came to his Lord with a pure heart [attached to Allah Alone and none else, worshipping none but Allah Alone true Islamic Monotheism, pure from the filth of polytheism]

﴿إذ جاء ربه بقلب سليم﴾ [الصَّافَات: 84]

Al Bilal Muhammad Et Al
Behold, he approached his Lord with a pure heart

Ali Bakhtiari Nejad
When he came to his Master with a sound heart

Ali Quli Qarai
when he came to his Lord with a sound heart [untainted by sin]

Ali Unal
He had turned to his Lord with a heart sound and pure (from any trace of insincerity of faith)

Hamid S Aziz
When he came to his Lord with a whole (sound, pure) heart

John Medows Rodwell
When he brought to his Lord a perfect heart

Literal
When he came (to) his Lord with a sound/safe heart/mind

Mir Anees Original
when he came to his Fosterer with a defect less heart

Mir Aneesuddin
when he came to his Lord with a defect less heart