It is narrated from Sayyiduna Malik bin al-Huwayrith (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) said the opening takbir (takbirat al-ihram), he would raise his hands up to his earlobes; and when he bowed he would do the same; and when he raised his head from bowing he would also do the same.
Isma'il bin Ulayyah narrated this hadith from Sa'id bin Abi Arubah, and at its beginning there is that he (peace and blessings be upon him) raised his hands and brought them close to his ears.
Likewise Hisham al-Dastuwa'i said the same from Qatadah in one of his two narrations, and in the other narration he said that he raised his hands up to his earlobes.
Shu'bah transmitted it from Qatadah, and he said that he (peace and blessings be upon him) brought his hands up to the level of his earlobes; and in another narration, that he brought them up to the level of his shoulders.
When these narrations differ, then either all of them are taken and one has the choice between them,
or the narration of the one about whom the reports differ is left, and the narration of the one about whom they do not differ is taken.
Imam al-Shafi'i (may Allah have mercy on him) said: Because it is more established in its chain, and it is the hadith of a number of narrators, and a number is more likely to preserve it than one.
The Shaykh (al-Bayhaqi) said: Along with these narrations, this is also the practice of Sayyiduna Umar (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2307