expression, noun
personal affair; one's own affair
Refers to something that concerns oneself personally, often used when contrasting with others' matters.
人のことより、まず我が事を考えなさい。
Think about your own affairs first, rather than other people's.
彼は我が事のように喜んでくれた。
He was happy for me as if it were his own affair.
Similar meaning, but 自分事 is more modern and often used in self-help or business contexts to mean taking something personally.
Compound of 我が (wa ga, 'my') + 事 (koto, 'matter, affair'). The reading わがこと is a standard rendaku form.