One brother earned a living & the other studied religious knowledge..

There were two brothers in the days of the Prophet (SAWS). One of them used to attend the Prophet's circle (to acquire knowledge) and the other used to earn their living. Once the latter complained to the Prophet (SAWS) against the former (for not earning his living).
He (SAWS) replied, "Perhaps you are being provided because of him".

[At-Tirmidhi]

Commentary: This Hadith evidently shows that it is permissible and desirable to devote oneself or make someone else to devote himself for religious knowledge. Such students of religious knowledge should not be considered a burden. Similarly, one should also not ignore those students and scholars who are devoted to such knowledge because Allah makes their help a means of increasing the donor's sources of subsistence.