Al-Kāfi

Hadith 1800
duaenemies
3ـ أَحْمَدُ عَنْ بَعْضِ أَصْحَابِنَا فِي الْمُبَاهَلَةِ قَالَ تُشَبِّكُ أَصَابِعَكَ فِي أَصَابِعِهِ ثُمَّ تَقُولُ اللهمَّ إِنْ كَانَ فُلانٌ جَحَدَ حَقّاً وَأَقَرَّ بِبَاطِلٍ فَأَصِبْهُ بِحُسْبَانٍ مِنَ السَّمَاءِ أَوْ بِعَذَابٍ مِنْ عِنْدِكَ وَتُلاعِنُهُ سَبْعِينَ مَرَّةً.
3. Ahmad has narrated from certain individuals of our people about al-Mubahalah this: “Crisscross the fingers of your hand with his fingers and say, ‘O Lord, if so and so has rejected a truth or has professed a falsehood, make him suffer misfortune from the sky or a painful punishment by Your command and then (the parties) renounce each other seventy times.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī