Jubayr bin Nufayr (may Allah have mercy on him) says that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) saw a young man praying; he had lengthened his prayer (that is, he lengthened the standing) and kept his bowing and prostration short. Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) asked: Is there anyone who knows him? A man said: I know him. Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: If I knew him, I would order him to lengthen the bowing and prostration, for I heard the Prophet (peace and blessings be upon him) say: "When the servant stands to pray, his sins are brought and placed on his head and shoulders; when he bows and prostrates, those sins fall off him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4697