BhG 17.20

syntax

deśe (in a [proper] place) kāle ca (and at a [proper] time) pātre ca (and to a worthy recipient) dātavyam iti (“it is to be given”)
anupakāriṇe (to one who is not giving in return) yat dānam (which gift) dīyate (it is given),
tat dānam (that gift) sāttvikam (sattvic) smṛtam (it is known).

grammar

dātavyam	–	dātavya (√dā – to give) PF. 1n.1 n. – to be given, what should be given;
iti	–	av. – thus (used to close the quotation);
yat	–	yat sn. 1n.1 n. – that which;
dānam	–	dāna 1n.1 n. – gift, charity (from: √dā – to give);
dīyate	–	√dā (to give) Praes. pass. 1v.1 – it is given;
anupakāriṇe	–	an-upakārin 4n.1 m. – to one who is not giving in return (from: upa-√kṛ – to help, to serve, upakāra – help, favour, service);
deśe	–	deśa 7n.1 m. – in a place, in a country (from: √diś – to show);
kāle	–	kāla 7n.1 m. – in time (from: √kal – to count);
ca	–	av. – and;
pātre	–	pātra 7n.1 m. – to a worthy recipient (from: √pā – to drink, pātra – vessel, capable person, recipient);
ca	–	av. – and;
tat	–	tat sn. 1n.1 n. – that;
dānam	–	dāna 1n.1 n. – gift, charity (from: √dā – to give);
sāttvikam	–	sāttvika 1n.1 n. – related to sattva (from: √as – to be, PPr sant – being, existing, true, the essence, abst. sattva – being, essence, wisdom, spirit, one of the three guṇas);
smṛtam	–	smṛta (√smṛ – to think, to remember) PP 1n.1 n. – it is known, it is remembered;

textual variants

deśe and kāle interchange the position;
smṛtam → viduḥ (they know);

Śāṃkara

idānīṃ dāna-traividhyam ucyate—
dātavyam iti evaṃ manaḥ kṛtvā yad dānaṃ dīyate’nupakāriṇe pratyupakārāsamarthāya, samarthāyāpi nirapekṣaṃ dīyate | deśe puṇye kurukṣetrādau | kāle saṃkrānty-ādau | pātre ca ṣaḍ-aṅga-vid veda-pāraga ity ādau | tad dānaṃ sāttvikaṃ smṛtam

Rāmānuja

phalābhisandhirahitaṃ dātavyam iti deśe kāle pātre cānupakāriṇe yad dānaṃ dīyate, tad dānaṃ sāttvikaṃ smṛtam

Śrīdhara

pūrvaṃ pratijñātam eva dānasya traividhyam āha dātavyam iti | dātavyam evety evaṃ niścayena yad dānaṃ dīyate ‚nupakāriṇe pratyupakāra-samarthāya | deśe kurukṣetrādau kāle grahaṇādau | pātre ceti deśa-kāla-sāhacaryāt saptamī prayuktā | pātre pātra-bhūtāya tapaḥ-śrutādi-sampannāya brāhmaṇāyety arthaḥ | yad vā pātra iti tṛj-antam | rakṣakāyety arthaḥ | caturthy evaiṣā | sa hi sarvasmād āpad-gaṇād dātāraṃ pātīti pātā | tasmai yad evambhūtaṃ dānaṃ tat sāttvikam

Madhusūdana

idānīṃ krama-prāptasya dānasya traividhyaṃ darśayati dātavyam iti tribhiḥ | dātavyam eva śāstra-condanā-vaśād ity evaṃ niścayena na tu phalābhisandhinā yad dānaṃ tulā-puruṣādi dīyate ‚nupakāriṇe pratyupakārājanakāya | deśe puṇye kurukṣetrādau kāle ca puṇye sūryoparāgādau | pātre ceti caturthy-arthe saptamī | kīdṛśāyānupakāriṇe dīyate pātrāya ca vidyā-tapo-yuktāya | pātra rakṣakāyeti vā | vidyā-tapobhyām ātmano dātuś ca pālana-kṣama eva pratigṛhṇīyād iti śāstrāt | tad evaṃ-bhūtaṃ dānaṃ sāttvikaṃ smṛtam

Viśvanātha

dātavyam ity evaṃ niścayena | na tu phalābhisandhinā yad dānam

Baladeva

atha dānasya traividhyam āha dātavyam iti | niścayena yad dānam anupakāriṇe pātre vidyā-tapobhyāṃ dātū rakṣakāya brāhmaṇāya yad dīyate tad dānaṃ sāttvikam | anupakāriṇe pratyupakāram anuddiśyety arthaḥ | deśe tīrthe kāle ca saṅkrānty-ādau