The Trick of the Eyes
Allah knows the fraud of the eyes, and all that the breasts conceal [Quran, Ghāfir (40):19]
يَعْلَمُ خَآئِنَةَ ٱلْأَعْيُنِ وَمَا تُخْفِى ٱلصُّدُورُ
Hunād b. Al-Sarī, Al-Zuhd article 1428.
Also read
Related sayings.
Ibn Abbas on the status of dutifulness to the mother. Also includes evidence of his change of opinion on the issue of the possibility of repentance for the crime of deliberately killing a believer.
As per general repect to elders, the Salaf would let someone who is older enter first, contrary to common practice today.