Whence is it derived that if one allows his dead one (i.e., one that he must bury) to remain overnight, he transgresses a negative commandment? From (Ibid.) "You shall not leave his body overnight on eitz." If he left it overnight for his honor, i.e., to bring a casket or shrouds, I might think he transgresses; it is, therefore, written "on the eitz" — Just as the eitz is demeaning to him, so, all that is demeaning to him (is forbidden, to exclude the above).
"You shall not leave his body overnight on the eitz" — a negative commandment. "but bury shall you bury it" — a positive commandment. What is to be done? We wait until it gets dark; then he is suspended from the eitz and then he is taken down. If not, he is in transgression of "You shall not leave his body overnight on the eitz."