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The usual Form of baptism was immersion. This is inferred from the original meaning of the Greek baptivzein and baptismov";678 from the analogy of John’s baptism in the Jordan; from the apostles’ comparison of the sacred rite with the miraculous passage of the Red Sea, with the escape of the ark from the flood, with a cleansing and refreshing bath, and with burial and resurrection; finally, from the general custom of the ancient church which prevails in the East to this day.679 But sprinkling, also, or copious pouring rather, was practised at an early day with sick and dying persons, and in all such cases where total or partial immersion was impracticable. Some writers suppose that this was the case even in the first baptism of the three thousand on the day of Pentecost; for Jerusalem was poorly supplied with water and private baths; the Kedron is a small creek and dry in summer; but there are a number of pools and cisterns there. Hellenistic usage allows to the relevant expressions sometimes the wider sense of washing, bathing, sprinkling, and ceremonial cleansing.680 Unquestionably, immersion expresses the idea of baptism, as a purification and renovation of the whole man, more completely than pouring or sprinkling; but it is not in keeping with the genius of the gospel to limit the operation of the Holy Spirit by the quantity or the quality of the water or the mode of its application. Water is absolutely necessary to baptism, as an appropriate symbol of the purifying and regenerating energy of the Holy Spirit; but whether the water be in large quantity or small, cold or warm, fresh or salt, from river, cistern, or spring, is relatively immaterial, and cannot affect the validity of the ordinance.
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Philip Schaff (History Of The Christian Church (The Complete Eight Volumes In One))