Al-Kāfi - Volume 5 > Words to Say When Buying for Resale Purposes
Hadith #4

4- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ إِذَا اشْتَرَيْتَ دَابَّةً فَقُلِ اللهُمَّ إِنْ كَانَتْ عَظِيمَةَ الْبَرَكَةِ فَاضِلَةَ الْمَنْفَعَةِ مَيْمُونَةَ النَّاصِيَةِ فَيَسِّرْ لِي شِرَاهَا وَإِنْ كَانَتْ غَيْرَ ذَلِكَ فَاصْرِفْنِي عَنْهَا إِلَى الَّذِي هُوَ خَيْرٌ لِي مِنْهَا فَإِنَّكَ تَعْلَمُ وَلا أَعْلَمُ وَتَقْدِرُ وَلا أَقْدِرُ وَأَنْتَ عَلامُ الْغُيُوبِ تَقُولُ ذَلِكَ ثَلاثَ مَرَّاتٍ.

4. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Mu‘awiyah ibn ‘Ammar, who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘When you decide to buy an animal, say this, “O Allah, if this is of great blessings, extra benefits and of a fortunate nature, I pray to You to make its purchasing easy for me. If it is otherwise, then turn me to what is better than this; You know and I do not know. You have power over all things but I do not have such power and You know the unseen.” You should say this three times’”