(So he (the disbeliever) neither believed nor prayed! But on the contrary, he belied and turned away!)(75:31-32),
وَأَعْطَى قَلِيلاً وَأَكْدَى
(And gave a little, then stopped) Ibn `Abbas said, "Gave a little, then stopped giving." Similar was said by Mujahid, Sa`id bin Jubayr, `Ikrimah, Qatadah and several others. `Ikrimah and Sa`id said: "Like the case of a people who dig a well, during the course of which they find a rock preventing them from completing their work. So they say, `We are finished' and they abandon the work." Allah's statement,
أَمْ لَمْ يُنَبَّأْ بِمَا فِي صُحُفِ مُوسَىٰ وَإِبْرَاهِيمَ الَّذِي وَفَّىٰ (Has he not been told of what was [ revealed ] in the scriptures of Musa and of Ibrahim who fulfilled [ his covenant ]?... 53:36- 37) In verse [ 37], the Prophet Ibrahim I has been described by the expression waffa which is derived from the root word wafa' and it means to fulfill faithfully the covenant one has made with someone.
Special Characteristic of Ibrahim (علیہ السلام) : fulfillment of Covenant
Holy Prophet Ibrahim (علیہ السلام) had a covenant with Allah that he will obey Him and convey His Message to all the people. He fulfilled faithfully the covenant: He obeyed Allah and delivered His Message to His creatures. As a result, he was made to pass through severe trials and tribulations. This is the interpretation placed upon the expression waffa (fulfilled) by Ibn Jarir, Ibn Kathir and others.
There are many who become inclined towards the Truth, but only to a certain extent. Then the compulsions of their interests become too strong for them and they revert to their original position. In order to justify and explain their wrong behaviour, such people devise different types of engaging ‘beliefs’. But this only increases their guilt because this amounts to adding insult to injury.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.