As for Abraham’s prayer for his father’s forgiveness, it was only in fulfilment of a promise he had made to him. But when it became clear to Abraham that his father was an enemy of Allah, he broke ties with him.¹ Abraham was truly tender-hearted, forbearing.

And Ibrâhîm’s (Abraham) invoking (of Allâh) for his father’s forgiveness was only because of a promise he [Ibrâhîm (Abraham)] had made to him (his father). But when it became clear to him [Ibrâhîm (Abraham)] that he (his father) is an enemy of Allâh, he dissociated himself from him. Verily Ibrâhîm (Abraham) was Awwah (one who invokes Allâh with humility, glorifies Him and remembers Him much) and was forbearing. (Tafsir Al-Qurtubî)¹.