Abdullah bin Abbas reported,
Milk was brought to the Messenger of Allah ﷺ, with Ibn Abbas on his right and Khalid bin Walid on his left. The Messenger of Allah ﷺ said to Ibn Abbas, "Do you give me permission to give Khalid a drink first?"Ibn Abbas replied, "I would not wish to prefer anyone over myself when it comes to the leftover drink of the Messenger of Allah ﷺ."So Ibn Abbas took it and drank, and then Khalid drank.
Ibn Majah 3426
Daifحدثنا هشام بن عمار حدثنا إسمعيل بن عياش حدثنا ابن جريج عن ابن شهاب عن عبيد الله بن عبد الله
عن ابن عباس قال
أتي رسول الله ﷺ بلبن وعن يمينه ابن عباس وعن يساره خالد بن الوليد فقال رسول الله ﷺ لابن عباس أتأذن لي أن أسقي خالدا قال ابن عباس ما أحب أن أوثر بسؤر رسول الله ﷺ على نفسي أحدا فأخذ ابن عباس فشرب وشرب خالد
No references are available.
[Daif] With no. 55, part of it was mentioned earlier, no. 3322, and the essence of the hadith is agreed upon (Bukhari, no. 5620, and Muslim, no. 2030), without mention of Ibn Abbas and Khalid 
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