Gittin

Scripture speaks of two heave-offerings, one the 'great terumah'  and the other the terumah from the Levite's tithe. Just as the 'great terumah' is set aside by estimate  and by intention,  so the terumah of the tithe is set aside by estimate and by intention; and just as the owner has the right to set aside the 'great terumah', so he has the right to set aside the terumah of the tithe. MISHNAH. IF A MAN SETS ASIDE PRODUCE WITH THE IDEA OF RECKONING IT AS TERUMAH AND TITHE,  OR MONEY WITH THE IDEA OF RECKONING IT AS SECOND TITHE,  HE CAN GO ON SO RECKONING IN THE PRESUMPTION THAT THEY ARE STILL EXISTING. IF THEY ARE LOST, HE HAS TO PROVIDE AGAINST THE RISK  FOR TWENTY-FOUR HOURS.  THIS IS THE RULING OF R. ELEAZAR [B. SHAMMUA]. R. JUDAH SAYS: WINE [SO SET ASIDE] HAS TO BE EXAMINED AT THREE SEASONS OF THE YEAR:  WHEN THE EAST WIND BEGINS TO BLOW AT THE END OF THE FEAST [OF TABERNACLES], WHEN THE BERRIES FIRST APPEAR [ON THE VINE], AND WHEN THE JUICE BEGINS TO FORM IN THE GRAPES. GEMARA. What is meant by FOR TWENTY-FOUR HOURS? — R. Johanan says: The twenty-four hours before his examining.  R. Eleazar b. Antigonus says in the name of R. Eleazar son of R. Jannai: