Ka'b ibn Mama al-Iyadi (Arabic: كعب بن مامة الإيادي) was a pre-Islamic Arab figure proverbial for his munificence, and in particular for "giving water to a companion and himself dying of thirst as result".
[2] Kaʻb died of dehydration in one of his travels when he favored his companion, al-Namari (Arabic: النمَّري), over himself for the remaining water they had carried.
His story with al-Namari displays a high degree of i'thar (altruism), a trait which the pre-Islamic Arabs regarded with great admiration.
This was done repeatedly until Kaʻb became completely exhausted and weak that the moment they found a well some time later, he wasn't able to move and eventually died of thirst.
If we take up medicine as our subject, you are Galen incarnate in your familiarity with it; if astrology, you are Hermes [Trismegistos] in your calculations; or if religious knowledge, you are 'Alī ibn-Abī-Ṭālib (God's prayers upon him) in mastering it; or if generosity is mentioned, you are better than Hatim in you liberality; or if we mention true speech, you are Abu-Darr in the truth of your tongue; or if nobility, you are Ka'b Ibn Mama in preferring others over yourself, and if loyalty, you are as-Samaw'al ibn-‘Ādiyā’ in your loyalty.