These ahaadeeth include the following:
The hadeeth narrated by Abu Dawood (749) from al-Baraa’ ibn ‘Aazib, which says that the Messenger of Allaah (peace and blessings of Allaah be upon him) used to raise his hands almost to his ears when he started to pray, then he did not repeat (this action).
The hadeeth narrated by Abu Dawood (748) from ‘Abd-Allaah ibn Mas’ood (may Allaah be pleased with him) who said: “Shall I not lead you in prayer as the Messenger of Allaah (peace and blessings of Allaah be upon him) did?” Then he prayed and he only raised his hands once.
See Nasb al-Raayah by al-Zayla’i, 1/393-407.
But these ahaadeeth were classed as da’eef (weak) by the imams of hadeeth.
The hadeeth of al-Baraa’ was classed as da’eef by Sufyaan ibn ‘Uyaynah, al-Shaafa’i, al-Humaydi the shaykh of al-Bukhaari, Ahmad ibn Hanbal, Yahya ibn Ma’een, al-Daarimi, al-Bukhaari, and others.
The hadeeth of Ibn Mas’ood was classed as da’eef by ‘Abd-Allaah ibn al-Mubaarak, Ahmad ibn Hanbal, al-Bukhaari, al-Bayhaqi, al-Daaraqutni and others. Similarly, the reports which were narrated from some of the Sahaabah about not raising the hands are all da’eef. We have quoted above the words of al-Bukhaari (may Allaah have mercy on him): “…it was not proven that any one among the Sahaabah did not raise his hands.”
See Talkhees al-Habeer by al-Haafiz ibn Hajar, 1/221-223.