To make the Heart Tender (Ar-Riqaq)
Ṣaḥīḥ al-Bukhārī 6538
يُجَاءُ بِالْكَافِرِ يَوْمَ الْقِيَامَةِ فَيُقَالُ لَهُ أَرَأَيْتَ لَوْ كَانَ لَكَ مِلْءُ الأَرْضِ ذَهَبًا أَكُنْتَ تَفْتَدِي بِهِ فَيَقُولُ نَعَمْ. فَيُقَالُ لَهُ قَدْ كُنْتَ سُئِلْتَ مَا هُوَ أَيْسَرُ مِنْ ذَلِكَ
yujāʾu bi-l-kāfiri yawma al-qiyāmah fayuqālu lah araʾayta law kāna laka milʾu al-arḍi dhahaban akunta taftadī bihi fayaqūlu naʿam. fayuqālu lah qad kunta suʾilta mā huwa aysaru min dhalika
Transliteration generated from the Arabic vowel marks
The full narration
Narrated Anas bin Malik:Allah's Prophet used to say, "A disbeliever will be brought on the Day of Resurrection and will be asked. "Suppose you had as much gold as to fill the earth, would you offer it to ransom yourself?" He will reply, "Yes." Then it will be said to him, "You were asked for something easier than that (to join none in worship with Allah (i.e. to accept Islam, but you refused)
Source
Ṣaḥīḥ al-Bukhārī · 6538