Is repentance for frequently making vows and swearing on the Quran sufficient, when one is unable to offer expiation financially or by fasting?

A Muslim should not make excessive oaths, as Allah the Almighty has condemned this. Contingent vows (nadhr mu'allaq) are prohibited because they do not avert anything, they extract from the miserly, and they add obligations upon the Muslim that he may not be able to fulfill. Whoever breaks an oath must offer expiation. Whoever vows an act of obedience must fulfill it.

If signs of puberty appeared during the period of the vow and oath, repentance alone is not sufficient. Rather, one must fulfill the vows and offer expiation for the oaths, and be cautious in this regard until one's conscience is clear. As for vows and oaths made before puberty, they are null and void and do not require expiation.

If you are unable to fulfill a vow of piety (nadhr at-tabarrur) due to an inability that is not expected to cease, then you must offer an expiation for an oath for each vow. As for a vow of obstinacy (nadhr al-lajaj), its maker has the choice between fulfilling it or offering an expiation for an oath.

Allah does not burden a soul beyond its capacity. Therefore, you should promptly offer expiation for the oaths and vows to the extent of your ability.