Hadith 1:

محمد بن يحيى، عن أحمد بن محمد بن عيسى، عن الحسين بن سعيد، عن فضالة ابن أيوب، عن سيف بن عميرة، عن أبي بكر الحضرمي قال: قلت لأبي عبد الله عليه السلام: أهل الشام شر أم [أهل] الروم فقال: إن الروم كفروا ولم يعادونا وإن أهل الشام كفروا وعادونا

Narrated Mohammad bin Yahya, from Ahmad bin Mohammad bin Isa, from al-Husain bin Saeed, from Fazalah bin Ayub, from Saif bin Amirah, from Abi Bakr al-Hazrami who said:

I asked Abu Abd-Allah Imam Sadiq (عليه السلام), "Are the people of Syria (shaam) worse or the people of Rome?"

Imam Sadiq (عليه السلام) said, "Verily the people of Rome disbelieved but do not have enmity with Us. While the people of Syria (shaam) disbelieved and had enmity with Us."

[Source: al-Kafi, Vol.2, Pg. 410, Hadith. 5]

Hadith 2:

أبوعلي الاشعري، عن الحسن بن علي الكوفي، عن عباس بن عامر عن علي بن معمر، عن خالد القلانسي قال: قلت لابي عبدالله عليه السلام: ألقى الذمي فيصافحني قال: امسحها بالتراب وبالحائط قلت: فالناصب؟ قال: اغسلها

Narrated Abu Ali al-Ashari, from al-Hasan bin Ali al-Kufi, from Abbas bin Aamir, from Ali bin Muammar, from Khalid al-Qalansi who said:

I asked Abu Abd-Allah Imam Sadiq (عليه السلام), "I meet a Zimmi (non-muslim staying in an Islamic country) and he shakes hands with me. 

Imam (عليه السلام) said, "Wipe it (hand) with sand or against the wall."

I said, "Then if its a Nasibi (one who has enmity with AhlulBait (ع) and their Shias)?" 

Imam (عليه السلام) said, "Wash it (hand)."

[Source: al-Kafi, Vol.2, Pg. 650, Hadith. 11]

Hadith 3:

يَحْيَى عَنْ عَبْدِ اللَّهِ بْنِ مُسْكَانَ عَنْ ضُرَيْسٍ قَالَ تَمَارَى النَّاسُ عِنْدَ أَبِي جَعْفَرٍ (عليه السلام) فَقَالَ بَعْضُهُمْ حَرْبُ عَلِيٍّ شَرٌّ مِنْ حَرْبِ رَسُولِ اللَّهِ (صلى الله عليه وآله) وَ قَالَ بَعْضُهُمْ حَرْبُ رَسُولِ اللَّهِ (صلى الله عليه وآله) شَرٌّ مِنْ حَرْبِ عَلِيٍّ (عليه السلام) قَالَ فَسَمِعَهُمْ أَبُو جَعْفَرٍ (عليه السلام) فَقَالَ مَا تَقُولُونَ فَقَالُوا أَصْلَحَكَ اللَّهُ تَمَارَيْنَا فِي حَرْبِ رَسُولِ اللَّهِ (صلى الله عليه وآله) وَ فِي حَرْبِ عَلِيٍّ (عليه السلام) فَقَالَ بَعْضُنَا حَرْبُ عَلِيٍّ (عليه السلام) شَرٌّ مِنْ حَرْبِ رَسُولِ اللَّهِ (صلى الله عليه وآله) وَ قَالَ بَعْضُنَا حَرْبُ رَسُولِ اللَّهِ (صلى الله عليه وآله) شَرٌّ مِنْ حَرْبِ عَلِيٍّ (عليه السلام) فَقَالَ أَبُو جَعْفَرٍ (عليه السلام) لَا بَلْ حَرْبُ عَلِيٍّ (عليه السلام) شَرٌّ مِنْ حَرْبِ رَسُولِ اللَّهِ (صلى الله عليه وآله) فَقُلْتُ لَهُ جُعِلْتُ فِدَاكَ أَ حَرْبُ عَلِيٍّ (عليه السلام) شَرٌّ مِنْ حَرْبِ رَسُولِ اللَّهِ (صلى الله عليه وآله) قَالَ نَعَمْ وَ سَأُخْبِرُكَ عَنْ ذَلِكَ إِنَّ حَرْبَ رَسُولِ اللَّهِ (صلى الله عليه وآله) لَمْ يُقِرُّوا بِالْإِسْلَامِ وَ إِنَّ حَرْبَ عَلِيٍّ (عليه السلام) أَقَرُّوا بِالْإِسْلَامِ ثُمَّ جَحَدُوهُ.

Narrated by Durays, who said,

"People disputed in the presence of of Abu Jafar Imam Baqir (عليه السلام). 

So some of them said, 'The wars fought by Imam Ali (عليه السلام) were with more evil people than the wars of the Prophet of Allah (صلى الله عليه وآله)." 

And some others said, "The wars fought by the Prophet of Allah (صلى الله عليه وآله) were with more evil people than the war fought by Imam Ali (عليه السلام)."

So Abu Jafar Imam Baqir (عليه السلام) heard them and said, "What are you saying?"

They replied, "May Allah keep you well, we are debating about the wars of the Prophet (صلى الله عليه وآله) and the wars of Imam Ali (عليه السلام)." Some of us are saying that the wars fought by Imam Ali (عليه السلام) were with more evil people than the wars of the Prophet of Allah (صلى الله عليه وآله). And others are saying that the wars fought by the Prophet of Allah (صلى الله عليه وآله) were with more evil people than the war fought by Imam Ali (عليه السلام)." 

Then Abu Jafar Imam Baqir (عليه السلام) said, "No, the wars fought by Imam Ali (عليه السلام) were with more evil people than the wars of the Prophet of Allah (صلى الله عليه وآله)."

So I asked him, "May I be your ransom, is the war of Ali (عليه السلام) with more evil people than the war of the Prophet of Allah (صلى الله عليه وآله)?" 

Imam (عليه السلام) replied, "Yes, and I will tell you about it. The wars of the Prophet (صلى الله عليه وآله) was fought against those who did not accept Islam, but the wars of Ali (عليه السلام) was fought against those who had accepted Islam and then they rejected it."

[Source: al-Kafi, Vol. 8, Hadith. 353]

Hadith 4:

وروينا عن أبي جعفر (ع) انه ذكر الذين حاربهم علي (ع) فقال: أما انهم أعظم جرما ممن حارب رسول الله صلى الله عليه وآله، قيل له: وكيف ذلك يا ابن رسول الله؟ قال: أولئك كانوا جاهلية وهؤلاء قرأوا القرآن، وعرفوا أهل الفضل فأتوا ما أتوا بعد البصيرة

Narrated that Abu Jafar Imam Baqir (عليه السلام) mentioned those whom Ali (عليه السلام) fought and said:

"They are greater in crime than those who fought the Messenger of Allah (صلى الله عليه وأله)."

He was asked, "How is that O son of the Messenger of Allah?"

The Imam said, "Those (who fought the Prophet) were people of ignorance, and these (who fought Imam Ali ع) have read the Quran and recognized the people of virtue, so they did what they did after having insight."

[Source: Manaqib Aal-e-Abi Talib, ibn Shehr Ashoob, Vol. 3, Pg. 18-19]