✅Answer: Please pay attention to the following narrations:

1 مُحَمَّدُ بْنُ يَعْقُوبَ عَنْ عَلِيِّ بْنِ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ رَفَعَهُ فِي قَصِّ الْأَظَافِيرِ تَبْدَأُ بِخِنْصِرِكَ الْأَيْسَرِ ثُمَّ تَخْتِمُ بِالْيَمِينِ

📚 Al-Kafi, vol. 6, p. 492

Translation: Ibn Abi Umayr narrated in a 'marfu' (elevated) narration that (the Imam, peace be upon him) said about clipping nails: 'You start with the little finger of the left hand (or foot) and you end with the little finger of the right hand (or foot).'

2 مُحَمَّدُ بْنُ عَلِيِّ بْنِ الْحُسَيْنِ قَالَ وَ رُوِيَ أَنَّهُ مَنْ يُقَلِّمُ أَظْفَارَهُ يَوْمَ الْجُمُعَةِ- يَبْدَأُ بِخِنْصِرِهِ مِنَ الْيَدِ الْيُسْرَى وَ يَخْتِمُ بِخِنْصِرِهِ مِنَ الْيَدِ الْيُمْنَى

📚 Al-Faqih, vol. 1, p. 127

Translation: Shaykh Saduq said: 'It has been narrated that whoever clips his nails on Friday, he starts with the little finger of the left hand and ends with the little finger of the right hand.'

✅ The order for clipping nails is clear in the two above narrations. However, some of the virtues of clipping nails on Friday should also be noted:

3 عَنْ عَلِيِّ بْنِ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ الْحُسَيْنِ بْنِ يَزِيدَ عَنِ السَّكُونِيِّ عَنْ عَبْدِ اللَّهِ عَنْ أَبِيهِ عَنْ آبَائِهِ قَالَ: قَالَ رَسُولُ اللَّهِ مَنْ قَلَّمَ أَظْفَارَهُ يَوْمَ الْجُمُعَةِ- أَخْرَجَ اللَّهُ مِنْ أَنَامِلِهِ الدَّاءَ وَ أَدْخَلَ فِيهِ الدَّوَاءَ.

📚 Thawab al-A'mal, p. 41, and Al-Khisal, p. 391

Translation: The Messenger of God (prayers of God be upon him and his family) said: 'Whoever clips his nails on Friday, God will remove disease from his fingers and instill medicine in them.'

4 عَنْ حَفْصِ بْنِ الْبَخْتَرِيِّ عَنِ الصَّادِقِ قَالَ: تَقْلِيمُ الْأَظْفَارِ وَ أَخْذُ الشَّارِبِ مِنَ الْجُمُعَةِ إِلَى الْجُمُعَةِ- أَمَانٌ مِنَ الْجُذَامِ.

📚 Amali al-Saduq, p. 250

Translation: Imam Sadiq (peace be upon him) said: 'Clipping nails and trimming the mustache, from one Friday to the next, provides safety from leprosy.'

5 عَنِ السَّكَنِ الْخَرَّازِ قَالَ سَمِعْتُ أَبَا عَبْدِ اللَّهِ يَقُولُ لِلَّهِ حَقٌّ عَلَى کُلِّ مُحْتَلِمٍ فِي كُلِّ جُمُعَةٍ أَخْذُ شَارِبِهِ وَ أَظْفَارِهِ وَ مَسُّ شَيْ ءٍ مِنَ الطِّيبِ الْحَدِيثَ.

📚 Al-Kafi, vol. 6, p. 511

Translation: Sakan al-Kharraz said: I heard Imam Sadiq (peace be upon him) say: 'For God, there is a right upon the neck of every adult (i.e., one who has reached the age of religious duty), every Friday, and that is to trim his mustache and his nails and to apply some perfume.'

6 عَنْ مُحَمَّدِ بْنِ الْعَلَاءِ عَنْ أَبِي عَبْدِ اللَّهِ قَالَ سَمِعْتُهُ يَقُولُ مَنْ أَخَذَ مِنْ شَارِبِهِ وَ قَلَّمَ أَظْفَارَهُ يَوْمَ الْجُمُعَةِ- ثُمَّ قَالَ بِسْمِ اللَّهِ عَلَى سُنَّةِ مُحَمَّدٍ وَ آلِ مُحَمَّدٍ- كَتَبَ اللَّهُ لَهُ بِكُلِّ شَعْرَةٍ وَ كُلِّ قُلَامَةٍ عِتْقَ رَقَبَةٍ وَ لَمْ يَمْرَضْ مَرَضاً يُصِيبُهُ إِلَّا مَرَضَ الْمَوْتِ

📚 Al-Kafi, vol. 4, p. 317

Translation: Muhammad ibn Ala said: I heard Imam Sadiq (peace be upon him) say: 'Whoever trims his mustache and clips his nails on Friday and says:

بِسْمِ اللَّهِ عَلَى سُنَّةِ مُحَمَّدٍ وَ آلِ مُحَمَّدٍ

God will write for him the freeing of a slave for every piece of hair and every piece of nail, and no disease will afflict him except the disease of death (i.e., the illness with which a person's life ends and with which he passes away).'

7 عَنْ أَبِي عَبْدِ اللَّهِ قَالَ: تَقْلِيمُ الْأَظْفَارِ يَوْمَ الْجُمُعَةِ- يُؤْمِنُ مِنَ الْجُذَامِ وَ الْبَرَصِ وَ الْعَمَى وَ إِنْ لَمْ تَحْتَجْ فَحُكَّهَا حَكّاً قَالَ وَ قَالَ أَبُو عَبْدِ اللَّهِ مَنْ قَلَّمَ أَظْفَارَهُ وَ قَصَّ شَارِبَهُ فِي كُلِّ جُمُعَةٍ- ثُمَّ قَالَ بِسْمِ اللَّهِ وَ بِاللَّهِ وَ عَلَى سُنَّةِ مُحَمَّدٍ وَ آلِ مُحَمَّدٍ- أُعْطِيَ بِكُلِّ قُلَامَةٍ وَ جُزَازَةٍ عِتْقَ رَقَبَةٍ مِنْ وُلْدِ إِسْمَاعِيلَ

📚 Thawab al-A'mal, p. 42

Translation: Imam Sadiq (peace be upon him) said: 'Clipping nails on Friday provides safety from leprosy, vitiligo, and blindness. And if there is no need to clip, rub them a little.' And Imam Sadiq (peace be upon him) said: 'Whoever trims his mustache and clips his nails and says:

بِسْمِ اللَّهِ وَ بِاللَّهِ وَ عَلَى سُنَّةِ مُحَمَّدٍ وَ آلِ مُحَمَّدٍ

For every piece of hair and every piece of nail, he is granted (the reward of) freeing a slave from the children of Ismail.'