Hadith regarding the saying of “Allahumma Rabbana laka-l-hamd or Rabbana walaka-l hamd” while in salah

Narrated by Abu Huraira:
Allah’s Apostle said, “When the Imam says, “Sami’ a-l-lahu Liman hamida,” you should say, “Allahumma Rabbana laka-l-hamd.” And if the saying of any one of you coincides with that of the angels, all his past sins will be forgiven.”
(Bukhari, Volume 1, Book 12, Number 762: )
Narrated by Abu Huraira:
Allah’s Apostle said, “When the Imam says, “Sami’ a-l-lahu Liman hamida,” you should say, “Allahumma Rabbana laka-l-hamd.” And if the saying of any one of you coincides with that of the angels, all his past sins will be forgiven.”
(Bukhari, Volume 1, Book 12, Number 762: )