"[4][3]Al-Harith ibn Kalada al-Thaqafi, from Thaqif and from the people of Taif, traveled to the Persia and learned medicine from a man from Jundishapur among others.
While treating patients and prescribing medicine, he added to that general advice that people benefit from in their lives.
Al-Harith ibn Kalada returned from Persia to his hometown of Thaqif in Taif, accompanied by his slave girl Sumayya, who was given to him.
Ziyad is the son of Sumayya, who gave birth to him in Taif from Abu Sufyan before he converted to Islam.
In the pre-Islamic era, men used to copulate with their slave girls, who might give birth to a child, and the father might then deny the paternity.
[6] Sumayya, the slave of Al-Harith ibn Kalada, had given birth to two sons before Ziyad, namely Abu Bakr and his brother Nafi'.
It is mentioned that King Jabar al-Kindi fell ill, and Al-Harith cured him, so he recovered and set out for Yemen.
It has been narrated that the Messenger of Allah, peace be upon him, ordered Saad ibn Abi Waqqas to come to him and consult him about an illness that had befallen him.
This indicates that it is permissible to consult the people of disbelief in medicine, if they are among them, and we have mentioned the story of Al-Harith ibn Kalada.
Muhammad ibn Ziyad al-'Arabī - and he had a knowledge of grammar and language - said: The lightness of the cloak means: that he does not have any debt.
Khosrow was impressed by Al-Harith's knowledge and wisdom, and he asked him many questions about medicine, philosophy, and religion.
Al-Harith replied, "If the Arabs are as you say, then they are in even greater need of a physician to cure their ignorance and improve their health.
A wise person will know how to protect themselves from disease by eating a healthy diet and living a balanced lifestyle."
Al-Harith replied, "The Arabs are a people of generous souls, brave hearts, eloquent tongues, and noble lineage."
Ibn Saad said: "Al-Harith ibn Kalada and Abu Bakr were eating a porridge that was presented to Abu Bakr, and Al-Harith said to Abu Bakr: "Raise your hand, O Caliph of the Messenger of God, by God, there is poison in it for a year, and I and you will die on the same day," he said: So he raised his hand, and they continued to be ill until they died on the same day at the end of the year.
Ibn Saad and al-Hakim narrated with a sound chain from Ibn Shihab that Abu Bakr and Al-Harith ibn Kalada were eating a porridge that was presented to Abu Bakr, and Al-Harith said to Abu Bakr: Raise your hand, O Caliph of the Messenger of God, by God, there is poison in it for a year, and I and you will die on the same day, so he raised his hand, and they continued to be ill until they died on the same day at the end of the year.
[13] In the history of Damascus by Ibn Asakir: From Ibn Shihab that Abu Bakr and Al-Harith ibn Kalada were eating a porridge that was presented to Abu Bakr, and Al-Harith said to Abu Bakr: Raise your hand, O Caliph of the Messenger of God, by God, there is poison in it for a year, and I and you will die on the same day, he said: So he raised his hand, and they continued to be ill until they died on the same day at the end of the year.