The reward for an obligatory act increases with the intention, as spending on one’s wife is obligatory and doing so is rewarding. So if one intends by that to seek Allah’s pleasure, his reward increases. [Fath al-Bari, Ibn Hajar (5/367)] أجر الواجب يزداد بالنية

The reward for an obligatory act increases with the intention, as spending on one’s wife is obligatory and doing so is rewarding. So if one intends by that to seek Allah’s pleasure, his reward increases. [Fath al-Bari, Ibn Hajar (5/367)] أجر الواجب يزداد بالنية