The word(s) "obligation" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) Freedom from obligation (is proclaimed) from Allah and His messenger toward those of the idolaters with whom ye made a treaty.

(سورة التوبة, At-Tawba, Chapter #9, Verse #1)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)

(2) And a proclamation from Allah and His messenger to all men on the day of the Greater Pilgrimage that Allah is free from obligation to the idolaters, and (so is) His messenger. So, if ye repent, it will be better for you; but if ye are averse, then know that ye cannot escape Allah. Give tidings (O Muhammad) of a painful doom to those who disbelieve,

(سورة التوبة, At-Tawba, Chapter #9, Verse #3)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)