Hadith No: 1
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah
Letter Waw - Part One - Waw followed by Lam - 9167: Al-Walid ibn Uqbah
Volume: (6) - Page Number: (482 / 483)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And when Uthman was killed, Al-Walid withdrew from the fitnah, neither participating with Ali nor with anyone else, but he would incite Muawiyah to fight Ali with his letters and his poetry. Among the things he wrote to Muawiyah when Ali sent Jarir to him, ordering him to enter into obedience and to take the pledge of allegiance from the people of Sham, was a message that reached Al-Walid, and he wrote in response with some verses:
A letter has come to you from Ali in his handwriting It is decisive, so choose to submit or to oppose him
And if you intend to answer his letter Then may the one who dictated it be cursed, and cursed be its writer
- He also wrote to him in another verse:
And you, with the letter to Ali, * Are like a tanner, while the leather remains untainted

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 6

Hadith No: 2
Al-Bayhaqi - Dalail al-Nubuwwah - Chapter on What Was Narrated Regarding His Informing of Abdullah ibn Mas'ud (ra) and Others That They Would Encounter People Praying the Prayer at Times Other Than Its Due...
Volume: (6) - Page Number: (399 / 340) - Footnote
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And it is said that some of the people of Kufa became biased against him and unjustly testified against him, as narrated by al-Tabari, which Ibn Abd al-Barr found objectionable. When Uthman was killed, al-Walid withdrew from the fitnah (civil strife) and did not participate in the events with Ali or anyone else. However, he was inciting Muawiya to fight Ali with his letters and poetry, including what he wrote to Muawiya when Ali sent him to Jarrir, ordering him to enter into obedience and take the pledge of allegiance from the people of Sham. When this reached al-Walid, he wrote to him these verses:

A letter has come to you from Ali in his handwriting, it is decisive, so choose to submit to it or fight it.
And if you intend to respond to his letter, may the one who dictated it be cursed, and cursed be its writer.
He also wrote to him these verses:

And you, along with the letter to Ali, * are like a tanner who has stained the hide while being patient.

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Reference: Dalaael al-Nubuwwah Book 6