The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
fell in one day
Compare (Num 25:9).
A discrepancy has been imagined. (Co1 10:8). Gives the number of deaths in "one day"; (Num 25:9); the total number of deaths "in the plague." Some discrepant statements concerning numbers are, however, found in the existing manuscripts of the Hebrew Scriptures.
These are most naturally ascribed to the fact that the Hebrews used letters in the place of numerals. The letters for "Koph" to "Tau" express hundreds up to four hundred. Five certain Hebrew letters, written in a different form, carry hundreds up to nine hundred, while thousands are expressed by two dots over the proper unit letter: for example, the letter "Teth", used alone, stands for the number 9; with two dots over the letter, it stands for nine thousand. Errors in transcription of Hebrew numbers thus becomes easy, preservation of numerical accuracy becomes difficult.
devils
(Greek, "daimonion"; (Co1 10:21);
(See Scofield) - (Mat 7:22).
fellowship
(Co1 10:16); Translated, communion.
saved
(See Scofield) - (Rom 1:16).