It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that Sayyiduna al-Zubayr (may Allah be pleased with him) gave a horse (in charity) in the path of Allah; then he found a horse from that horse's offspring being sold, and he was forbidden to buy it.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12719