It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that when any of his children reached puberty, he would separate him, and he would not enter (his room) without permission.
Hadith Referenceالادب المفرد / كتاب الاستئذان / 1058
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه مسدد كما فى إتحاف الخيرة المهرة : 5300»