Bara bin Azib reported,

This was revealed concerning us, the company of the Ansar. We were owners of palm trees, and each man would bring from his palms according to how much or how little he had. A man would bring one cluster of dates or two and hang them up in the masjid. The people of the Bench had no food, so whenever one of them grew hungry he would come to a cluster and strike it with his stick, and unripe dates and ripe dates would fall, and he would eat.But there were some people with no desire for good who would bring a cluster containing shrivelled, worthless dates, or a cluster that was already broken, and hang it up. So Allah Almighty revealed, "You who believe, spend from the good things you have earned and from what We have brought forth for you from the earth, and do not aim at the bad of it to spend from it when you yourselves would not take it except with your eyes closed" [Baqarah 2:267].They said, "If any of you were given the like of what he gave, he would not accept it except with his eyes shut or out of embarrassment."He said, "After that, each of us would bring the best of what he had."

في قوله تعالى: {ولا تيمموا الخبيث منه تنفقون}

عن البراء قال

نزلت فينا معشر الأنصار، كنا أصحاب نخل فكان الرجل يأتي من نخله على قدر كثرته وقلته، وكان الرجل يأتي بالقنو والقنوين فيعلقه في المسجد، وكان أهل الصفة ليس لهم طعام، فكان أحدهم إذا جاع أتى القنوفضربه بعصاه فيسقط البسر والتمر فيأكل، وكان ناس ممن لا يرغب في الخير يأتي الرجل بالقنو فيه الشيص والحشف وبالقنو قد انكسر فيعلقه، فأنزل الله تعالى: {يأيها الذين ءامنوا أنفقوا من طيبات ما كسبتم ومما أخرجنا لكم من الأرض ولا تيمموا الخبيث منه تنفقون ولستم بءاخذيه إلا أن تغمضوا فيه} قالوا: لو أن أحدكم أهدى إليه مثل ما أعطي، لم يأخذه إلا على إغماض أو حياء، قال: فكنا بعد ذلك يأتي أحدنا بصالح ما عنده.