It was narrated from Ibn 'Umar and 'Aishah that the Messenger of Allah (ﷺ) said:
"Whoever demands his rights let him do so in a decent manner as much as he can." (ES)
English reference (ES): Vol. 3, Book 15, Hadith 2421 (ES)
Arabic reference (ES): Book 15, Hadith 2515 (ES)