Anas bin Iyad (may Allah have mercy on him) narrated this hadith from Ubaydullah bin Umar (may Allah have mercy on him), and at its end there is this addition: "When you pray in this way, your prayer will be complete; and if you fall short in any of this, you will only be falling short in your prayer." In it there is also: "When you stand for prayer, perform ablution thoroughly." He did not include what Abu Usamah included at the end of the hadith.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3944