Jabalah bin Suhaim reported:
We were with 'Abdullah bin Az-Zubair (May Allah be pleased with them) in a time of famine, then we were provided with dates. (Once) when we were eating, 'Abdullah bin 'Umar (May Allah be pleased with them) passed by us and said: "Do not eat two dates together, for Messenger of Allah ﷺ prohibited it, unless one seeks permission from his brother (partner)."

[Al-Bukhari and Muslim].

عن جبلة بن سحيم قال: أصابنا عام سنةٍ مع ابن الزبير، فرزقنا تمراً، وكان عبد الله بن عمر رضى الله عنهما يمر بنا ونحن نأكل، فيقول: لا تقارونوا، فإن النبى نهى عن الإقران، ثم يقول:
"إلا أن يستأذن الرجل أخاه" متفق عليه