Qasim bin Abd al-Rahman al-Ansari (may Allah have mercy on him) and Sayyiduna Ibn Umar (may Allah be pleased with them both) went to a man of the Ansar. They bargained with him over land of his, and he bought it from him. Then a man came and said: "I saw that you bought land and gave it in charity." Sayyiduna Ibn Umar (may Allah be pleased with them both) said: "This land belongs to my son Waqid, for he is poor." He gave it to him as a gift to the exclusion of his other children.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الهبات / 12006