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." (TR)
English reference (TR): Vol. 3, Book 15, Hadith 2421 (TR)
Arabic reference (TR): Book 15, Hadith 2515 (TR)