It is reported that Imam Malik ibn Anas {May Allah have Mercy upon them} once said to a young boy from among the Quraysh:
“O! Son of my brother, learn etiquette before you acquire knowledge.”
مَالِكَ بْنَ أَنَسٍ ، يَقُولُ لِفَتًى مِنْ قُرَيْشٍ : يَا ابْنَ أَخِي ، تَعَلَّمَ الأَدَبُ قَبْلَ أَنْ تَتَعَلَّمَ الْعِلْمَ
{The Adornment of the Friends of Allah ~ Hilyatul’ Awliyah}