manna from heaven 天赐之物；(从天而降的)恩赐

【例句】
To the refugees, the food shipments were manna from heaven.
对于难民来说，运来的食物宛如天赐。

The large anonymous donation was manna from heaven for the church hall fund.
那一大笔匿名捐款对教堂礼堂筹建会来说真是天赐之财。